Why the sudden popularity of 12 inch arms

Raul,
Thank you for pointing out the derivations of certain pivoted arms.
As there are basically 2 commercially successful methods to achieve the pivoted arm principle (unipivot and double gimbel bearings...the Schroeder double magnet bearing is still essentially a unipivot), and as there are hundreds of different models and/or manufacterers over the last 30 years alone, it seems reasonable that they are all variations on a theme.
It's like saying all turntables are derived from the belt-driven platter, the direct-drive platter or the idler-wheel drive.
In other words...it's not telling us anything!
OK Raul, I have a 30 year old Technics 1200 with Nagaoka MP11 MM cartridge and you would be amazed at how it sounds. It will easily equal the sound of all the new high priced turntables/arms/cartridges available today.
Come to my place and hear....you will be surprised....you can try it?
And please stop using that ' Agoner' quote??......it has no meaning in either English OR Spanish!

Dear Halcro: +++++ " ...it's not telling us anything! " +++++

well, IMHO I think that today are " different " TT/tonearm/cartridge gear but unfortunately those "different " does not give us a bettter quality performance.

Seriously, I would like to travel to your lovely country but I can't do it.

The Agoner' quote: maybe has several interpretations, what I understand is that the know-how and audio/music experiences can/could be more important that buy high price ( new kid on the block ) audio items with out that know-how.
Of course that if you have an in deep know-how and you are wealthy then things could happen more easy and faster ( I'm talking about achieving audio system stellar performance. )

Dear Halcro, Sirspeedy put that subject in the right perspective.

Regards and enjoy the music.
Raul.

Raul, while everybody appreciates your enthusiasm, it sure does seem to be difficult to get you to benefit from more knowledgeable members. You posted that only the manufacturers could answer the OP. I suggest you do call or write to Tri Mai. Mr. Triplanar, as I'm sure you know. This gentleman is perhaps one of the nicest, most affable, most knowledgeable folks I know in the business. He could most certainly explain the differences that have lead to dramatic improvements to a tonearm you claim is no better now than 20 years ago. Will you believe him? Next, I suggest a phone call to Mr. George Merrill. I'm sure that name rings a bell? He would be happy to talk to you. There may not be another person on the planet who is more qualified to help you get the most from your vintage equipment. He can also explain why, and which components have come the farthest in the last thirty years. The average age of most of your system. I look forward to hearing from you after the conversations! Z.

I don't want to give the "suspicious" poster the impression that I am downplaying the "top" stuff of today.Also,I basically can't state that the superb retro set-ups I've heard are comparable,in all "meaningful" areas to such componentry.
What I am saying(from being lucky enough to hear a ton of differing system approaches)is that we(myself included)can easily get caught up in the "gadgetry race".Sometimes over-thinking/analyzing the mechanical aspects of "our" hobby can be a detriment(not always),and this can easily become an expensive game of musical chairs.
I assume(hopefully)that the majority of us got into the hobby for the love of the "music" firstly!I did.
Once one gets into this hobby,deeply,it is very easy to get too into the "gizmotic"(made that word up)aspects of why our stuff sounds so good.We like the reinforcement of industry folks,like good reviews,and good word of mouth to make us feel better about what we have invested in.Also,it is very cool to get good feedback from other owners,and see posts of how they,like us,love some familiar products.
There is a large contingent of music lovers/lp collectors that think that the equipment aspect of the hobby is there ONLY to serve the music.No big stretch there,and almost everyone feels similarly....BUT,these guys(many of which I've met over the years at The Princeton Record Exchange)"really get off" only on the music.The equipment is "nice" to them,but to hear them "go off" on a particular LP "find",and the performance held within the grooves,really has made me feel "sort-of" too materialistic.Liking the "hard work" I've put in, and sonic attributes of my mechanical devices,used to play "music",maybe a bit too much!

I am not eloquent enough to put across the point I am trying to make!

I think that if you have spent alot of time "collecting" and putting together a GREAT music collection(dwarfing the legitimate viability of the materialistic aspect of the hobby)it is far easier to become enraptured with the way music affects us.
There REALLY IS A TON of "not the latest",but "SO" enjoyable systems out there,that it is not hard to become adjusted to different sonic approaches taken by some, in this hobby!
It's nice to "let up" a little on our inner "critical listener",sometimes....When things sound "right"!!
Some time ago,while collecting at Princeton,I ran into this exchange student,from Korea.WHAT A LOVELY GUY!!!
A real music lover/lp collector.He got SO enthusiastic about the hobby(he liked equipment too,but could not afford the latest)during our discussion,that he asked me if I wanted to give a listen to some of his LP "finds" that he had made,during the ONE semester he would be in this country.He was like a little kid,showing me his new toys.Such enjoyable enthusiasm.Instant commradery!
So,I decided it would be worth while to get another "take" on how someone else,from another culture approached the hobby,while in my community.He loved RCA,Mercury,Decca classical stuff,like me.
I was bowled over by this simple setup!!!Not a large room.Not very pricey stuff.Just "truly" wonderfully reproduced "music".He surely knew what he was doing!!
I had a great time...The fellow lost hid grant,soon afterwards and went back to Korea,but I know a LOAD of good LP's went with him!I've not heard from him since,but always show my wife,and daughter the little yellow house he lived in,when we pass by.
Good equipment could be had,quite easily.Getting those priceless LP's would be alot harder!
Sorry for my rant!

Dear speedy, I have been collecting lps for about 30 years. At last count I had over 6000. I quit counting some time ago... I still have the turntable I bought before I bought my first lp. It would be my pleasure to point you to the shelves and say "pick which ever you want" and we will play them. First, on my 30-some year old turntable, that looks and performs better than new, and was "state of the art" 30-some years ago. Then we will play it on something quite new, though SEVERAL rungs down from SOTA. You can tell me/us which one made the music more enjoyable for you. I think I know the answer, and if I'm wrong, you can HAVE the new turntable! How's that?