@faustuss
Cogging! please don’t make me laugh, if cogging was audible, they couldn’t get anywhere near those Wow and flutter figures. Read up on how they measure Wow and Flutter and consider this for yourself, it just doesn’t add up.
I’ve never seen anything written by Technics about cogging and would welcome a link to anything. All designs evolve for a verity of reasons, DD motors are no different, but the stability of these, as measured, has changed little.
Cogging was a term first coined by belt drive manufacturers, to put down DD technology in the early days. The wow and flutter figures of which, they couldn’t match by a factor of 10, at anywhere near the price point.
Belt drive TT’s use electric motors to, that would cog in a similar way, but I stick to my main issue with it, that if it were a real factor, it would destroy wow and flutter figures, which it doesn’t.
@yoyoyaya
I still say the changes are small, so they bolted a brass plate on top of the platter to create extra mass, wow. The Plinth was always die cast and they had to do something with the arm, the early one used a plastic yoke.
I’m not criticizing, I’m a fan of the Technics tables, but realistic about how much they have improved, over what performed pretty good anyway, despite some dodgy engineering decisions back in the day. The build quality and improvement to parts design has undoubtedly got better, but what impact has any of this had on performance, in any significant way? 
My own Technics DD motor based turntable has more radical changes.
Including my own external power supply, internal regulator and inverted ceramic tipped bearing.

