Why According to some Turntable extremists Pitch Control and Direct Drive is Sacrilege?

My Notts turntable sounded way way better after I inserted a Walker Audio Precision Motor Controller into the AC supply and calibrated the speed.  However, everything associated with speed stability (e.g., pitch stability most easily detected with piano music) got even better when I replaced the Notts with a Lenco L75.  And the Lenco got better with the addition of the Phoenix Engineering stuff, including the RR.  Once the Lenco is up to speed, the RR feedback is doing very little; you can see that by the frequency with which the unit tells you it is making corrections.  The frequency of flashing goes way down to once every several revolutions, whereby the unit is making corrections on the order of less than .01 rpm, up or down. So I don't see how the RR corrections could be causing any audible treble problems, but you hear what you hear.

I would not call it treble problems, the treble is just cleaner without 
correction. The heavy platter in combination with very low friction 
imparts a stability on its own, very little correction is needed.
I still use the Road Runner for calibration, on days with large power
fluctuations, a short connection with the needle in the groove brings
speed up to 33.333 rpm, and it stays there without additional 
correction.

You hit the Nail on the head!!!  Heavy platters for belt drives is the way to go.  The difference in sound is huge.  I feel need to build a heavier platter.  Have one at 33 and another at 40 lbs.  Most of the lead is in the outer radius so that helps alot.  

How do you set a 100 lb platter on the bearing???  What was the difference in sound with the extra  50 lbs???

Enjoy the ride
Tom

@lewm

I have access to a very fair priced Lenco L75 and was interested especially after reading some of the posts here.
What would you say in your owners opinion would be essential upgrades to a completely stock L75 without going crazy on pricing?
Thx

The extra 50 lb stainless steel platter was  added on top of the original lead platter with no pressure on the air bearing.
With crossed fingers the compressor was started, and the bearing 
did it’s job without complaining. I give the platter a startup
push and target speed is reached in about 30 seconds.
The power supply actually ramps power up and down in the startup
fase to minimize belt slip/wear. The belt runs on a sub platter that is also the upper part of the air bearing , and is relatively short, custom 
made for me by Origin Live in the UK.
The extra 50 lb gives you better image stability, and improved dynamics and bass. I did not expect the level of improvement 
that where the result.