I own many classic/vntage arms as well as modern, some modified.
The main issue with classic arms such as the FR64S/SME3012R most of the Micro Seiki arms and SAEC arms, and others of that era that are now popular are the non offset bearings. Nobody raises this issue.
As you are no doubt aware, with non offset vertical bearings, when you change VTA the azimuth changes. For those that are not aware of this issue, place the palm of your left hand over your right at an angle ( offset angle of cartridge ). Lift you right elbow up and down - you will notice that your left hand ( the cartridge ) rotates - lift your elbow up and it rotates anticlockwise, lower your right elbow and the left hand ( cartridge ) rotates clockwise.
Most modern arms now use offset vertical bearings so that when you alter VTA azimuth remains constant.
On my FR64S for example, when dialling in VTA the soundstage moves all over the place and the azimuth has to be rechecked each time. This is a royal pain in the a**.
As far as the SAT goes, I've heard enough to know that it is an exceptional arm, whether you agree with the design choices or not. The value proposition is very simply - do you have the disposable income, and if so, does it do what you want - it's an individual choice. Why knock folk who choose to buy it - I say good luck to them, hope it works.
For me the best arm is simply what can I afford that gives the best performance for my preferred cartridge choice in the context of my total system.
The most neglected issue that most ignore when it comes to discussion of arms and cartridges, is that all arms are not perfect, all cartridges are not perfect, and arm/cartridge combination ( the combination of 2 imperfect variables ) is arguably more critical than the individual choice of arm or cartridge.
I see so often folk spending $2-5k on cartridges for arms that either don't match or are not up to a standard that will exact anything close to the full potential of the chosen cartidge, In my experience poor arm/cartridge matching results in musical dissatisfaction every time - and costs more in the long run to fix.