Why Linear Tracking never took off?

I go back an forth on such design. I think the servo system is not as bad as what people might think. It can sound excellent. My Yamaha PX2 is one great performer.

I always wish someone can make a tonearm mounting system that allows you to install your pivot arm on it and then servo control its lateral movement, gliding one direction like the Rabco. Imagine a gliding armboard with your favorite pivot arm and then you can compare it to the fixed position in its typical pivot operation. Of course when operating tangentially, user has to neutralize the typical 23 degree offset angle at the headshell to zero degree. This will settle the argument against or for tangential servo arm. Manufacturers please take note. The THK system will work handily.

What if I put an armboard on top of a THK motion track and use the Rabco part for sensor and motorization. I bet that will work if look bulky. Just imagine a Rabco mounted upside down. A typical 9" pivot arm will work just fine. The whole thing won't be able to sit on top of typical turntable plinth and it will have to be next to the plinth as a separate arm pot. It should work for tables like Teres or ones with small plinths. So many projects, so little time......