Linear tracking turntables, whatever happened?

I will chime in with the problem with straight line tracking air bearing arms is definitely the pump and all parts of the air supply leading to the TT.  I had a Maplenoll Ariadne air bearing TT/arm combo for 12 years that was absolutely the best sounding somewhat reasonably priced combo ever built.   The problem is it needed very clean 40 PSI pressure to make the arm bearing work.  The TT would be fine with about 5 PSI.  They had a splitter near the TT that would channel the air to both TT and arm in separate tubes.  There needed to be a governor on that splitter that would divert say 85%of the air to the arm and only 15% to the TT.  If that had been done, who knows just how great the 'Noll might have been.  However, in addition to an extremely loud pump that needed isolation from the room you listen in, I really couldn't run for 4 hours without having overheating problems and either shutting down permanently or rupturing the diaphragm that allows it to pump air.  It also required a filter to clean the air, an air plenum to take the condensing water out of the line caused by the high powered pump--and all these things need a separate aquarium tube to run to each piece from the other.  The setup did not get out of alignment as long as it was leveled and not moved.  GOOD!  The air supply to the TT/arm could be stopped by any of the parts of the air supply delivery crapping out or any of the hose connections popping free from the pressure.  VERY BAD.  Solved that after the first time it happened that way putting on of the small plastic locking straps snugged good over the tube at each connection.