Are advances in technology making speakers better?

Technology HAS made speakers better. Today's modest bookshelf speakers are light years ahead of most bookies say of 40 years ago.  But the basic technology used most often (a flapping piece of paper driven by a magnetic motor) hasn't changed. However, as others note, the materials technology has changed a bunch. Neodymium magnets, stiffer but lighter materials, the knowledge of how to properly brace a speaker cabinet to eliminate coloring resonances using computer simulations, and yes, computer simulations that can drastically cut down on the number of prototypes needed to be built so that the designers can get it "right"
the first time.  

For instance, compare any speaker from 1982 that cost about $1200/pair with Andrew Jones' Sourcepoint 10 here in 2022 at $3600.  The relative value, allowing for inflation, is the same. 

But that doesn't mean you have to upgrade every 5 or 10 years. Buy what you can feel comfortable with, but then just enjoy it for at least 15 or even 20 years. 

The increments in sound quality increases are small but over 20 years they can add up. Or at the very least, make quality sound available at prices no one would have dreamed of back in 1982. 

The only reason to change is if you desire something else - a sonic signature change as it were.  If that is the real impetus behind your wanting to "change" then go for it and make yourself happy. Life is short. Listen all you can. 

Many are speaking of changes as if they are advances.  Many changes are not advances or are seen later as not advances.  Changes can be a form of confirmation bias especially for those who devise them but also for unwary punters.  It can take time to verify if a change is an advance.

I think that @moonwatcher has just about said it all, and I agree.

Most of the advances in the last 60 years have been to make speakers more compact rather than to improve sound.  Earlier speakers that were all out assaults on sound quality were gigantic in size.  The advent of stereo made them even more impractical.  Shrinking the size became even more sensible when the transistor made higher powered amps needed for smaller speakers (lower in efficiency) cheaper to produce.  But, you can take the drivers in some of these very old systems and build extremely good systems that can easily rival the best modern systems if you have the money and the space.  I’ve heard a few, but I don’t have that kind of space or money.  One of the was almost five feet wide, 4 feet seep and nine feet tall; one only saves on amp space because one can drive this thing to ear-splitting levels with a couple of watts.

As to The new Mo-fi speaker, which I’ve heard and found very impressive, it is very much old-school in many respects: paper cone,  pleated surround, silk fabric dome for the co-axial tweeter.  The only thing “new” is the 30-year or so practice of using neodymium magnets.  Also, it is very large for a stand-mounted speaker, and this is very much and old school approach to sound quality.

@moonwatcher I agree you summed it up well. While the original problem by the OP didn't inspire me to get serious, the comments made it one of the most educational thread for me.

I think it's easier than ever to put together a horrible sounding system from a lot of money. It's also easy to buy a pair of cheap, active, wireless speakers and play music from your phone and get incredible sound. Technology can improve a lot, it's up to us how we adapt. Advances can make products cheaper, more accessible, easier to use, more accurate, longer-lasting, "faster", easier to integrate, etc. - if we are looking for sound quality improvement, it's on the list but just one of the many areas.

And I think there is truth companies trying to sell new releases for the sake of making money. Not in the audio business specifically but in the tech space in general. Saying that they are all honest is unfortunately way too optimistic. I have upgraded my phone 3 times in the last 10 years and I see so little improvement, I would be just as happy with my 2012 version as with the latest. But of course I don't spend 6 hours with my phone a day (only 4, haha!)