Why do turntables sound different?

You were wondering why tables sound different. I mentioned the bearing because it is an often overlooked component that enormously contributes to sound quality. 

Bearing friction plays a large role in a decks subjective sound with higher friction designs often but not always imparting a dark, slow signature.  "Stretchy" rubber belts also are responsible for this type of sound. 

Without knowing more about it the sapphire/ceramic design should have far less drag.  

Very very good turntables, like other great components have exceptional transparency, which makes them sound more alike than different. 

I would think that would make for a noticeable improvement. Also, don't misunderstand, as I think the Technics are excellent and great value too. I just think this whole w&f measurement thing is way overblown.  Maybe I am biased as I had some woeful experiences with direct drive Denons from the 70s and 80s that were a hollowed out grey sounding mess. 

In my opinion, there is a certain "musicality" that's missing in many direct drives. Inner detail, densely woven layered imagery, finesse etc. I would call them macro machines as they get a lot of the big things right, but miss out on the subtleties that make an exceptional table. One reason for this is they are NOT necessarily more speed stable than belt drives. My tables in particular often produce less wow flutter and drift. Coupling a motor to the platter, in my estimation is a compromised design. Modifying them and adding a good match may produce a better result, and I have not heard the modded tables, and of course variables like the room matter too.  Also, achieving the lowest possible w&f does NOT automatically make for a good sound. Other design criteria are just as important. 
Just my opinion

Yes,  and perhaps more often built to a price point jeopordizing performance potential.