High mass vs Low Mass Turntables - Sound difference?

There are few modern linear arms made with air bearing just like air-hockey.

On the contrary there are many -
Eminent Technology, Air Tangent, Cartridge Man, Bergmann, Kuzma, Walker, Zorin, Terminator just to name a few.

I never had any kind of problems using Terminator T3Pro LT on my ORACLE DELPHI.The sound was very convincing, quite incredible to be honest for a BD suspended deck. The best I ever had heard hands down.

It is not possible to balance an air bearing arm on the Oracle if it is properly set up, suspension is too soft. Been there. If you balance the arm to 0, i.e. floating, you can see the arm drifting either side of the centre of travel as the suspension shifts. This is clearly audible in a good system.

As 3blm  said, high mass platters have lower wow and flutter and a lower noise floor. If the manufacturer is careful, and uses a low power motor, wow and flutter pretty much disappear. If the bearing is air, the noise floor converges to zero.

My ORACLE`s suspension is not "too soft", it´s just works superb. I can make my suspension bouncing up and down (3.5 Hz) whilst playing a record with excellent sound quality. The early DELPHIs with soft suspension are superb performers IME. I never liked DELPHI IV with stiffer suspension.
And with hard acrylic mat it sounded quite awful, to be honest.

Avanti, On many counts, your analysis is not entirely correct.  Without going through all the arguments, if you like belt-drive you want the pulley and the platter to be as similar in diameter as practical, and as close together, center to center, as practical. This reduces belt-creep and enhances transfer of motor torque to the platter.  Also, why does having a small pulley driving a large diameter platter prolong motor and bearing life? The motor has to spin faster in inverse proportion to the ratio of the diameters of pulley and platter, which I would think would tend to shorten motor life.  Ditto for the bearings, especially the motor bearings. Belt life; that's a toss-up.  But just the fact of using a belt places side stress on both motor and turntable bearings.