Why hasnt a turntable manufacturer produced a table with automatic tonearm return/shutoff?

I would think that a device to raise the arm at the end of play would be quite easy. Simply When the arm reaches the inner groove, it triggers a sensor that raise the arm. However, a device that moves the arm back to it staring position would be much more problematic, as it would require physical interaction with a delicate arm structure.

I often read opinions about the use of a USB connection from the streamer to the DAC as being inferior. In my opinion, it all depends on the design and how much time and attention was invested in the USB input. I would make the radical assumption that this principle also applies to turntables. If I were looking at a $300,00.00 turntable with an automatic tonearm lift, I would expect that the tonearm mechanism was designed so that it didn’t compromise the sound quality of the turntable. The Thorens TD160 and the TD145 MK1 are the same turntable except the TD145 has an automatic tonearm lift at the end of the record. They both look the same and they sound the same. I bought a TD145 MK1 around 2011 for $200.00 as a project. So far I’ve done everything to it except install a better tonearm. The auto lift no longer works but either way, it doesn’t sound any different. Anyway, I like to think that I have an open mind. That being said, if I were to spend $6,000.00 on a VPI turntable, I wouldn’t want an auto lift.

What's the point of an auto tonearm return?  Having a cartridge in the run-out groove causes essentially no wear to the cartridge or the turntable.  How long are we talking about?  A few minutes, a half hour, overnight?  I'm less comfortable with overnight, but I still argue that it has no negative effect on the cartridge/turntable. 

Raising the tonearm and/or returning it to the rest position involves Rube Goldberg type mechanisms.  Probably a negative effect on sound quality and an increased risk of breakage.  Stopping the platter from continuing to rotate could involve a relatively simple photo sensitive electronic switch.  Would that solve most people's concerns?

The Goldmund Studio/T3F straight-line tracking tonearm, with servo control lifted the tonearm off the turntable if it detected vibration. That’s how I realized the 1989 Loma Prieta earthquake was happening: the tonearm felt it before I heard it and lifted itself off the turntable. I felt the quake a couple of seconds later.

However, It does not lift the tonearm off that until it reaches the end of the record. And, of course, Goldmund doesn’t even make it any more. And it was already expensive in 1988. I'm sure some manufacturer should be able to design a straight-line tracking tonearm. I doubt it will be inexpensive, though.

Most manufacturers want to avoid vibration, which isn’t heard on the typical pop record, but is easily heard on the state-of-the-art records made decades ago. So, they don’t put a tonearm lift, just as they usually don’t usually include a dust cover. Both add vibration, which is fine if I’m listening to modern pop records: they are, for the most part, electronically manipulated anyway, so there’s no low level detail to miss. 

But Classical? Or jazz? I miss hearing the finer details. Some people don’t.