Except:

- No pain

- No breaks

- No protesting/strikes

- No rises needed

- No happiness to take care of

All things business find annoying.

Instead of a large group of low power, easily manipulatable and controllable workforce, you will have traded for a small group of very powerful, wealthy and influential business and tech people who now fully control the production of your labor. I'd be very worried if I was that business, in terms of the control that company would now wield over me.

They could release a software update and disable your entire workforce unless you agreed to pay more money. They could slow your workforce down to prop up a competitor, etc.

They're going to have lots of downtimes and constant raises. Human joint longevity is insanely long by standards of robotics, and supplier costs only go up.