> You can't just say, as you do, that employees might as well go home since they aren't working.

Why not?

As long as you are satisfied with the productivity of that employee, what does it really matter if they produce their output in 10 hours or 40?

I get that the idea is that "if they can do this in 10 hours, then in 40 hours they should produce 4x as much!" But that's clearly not reality. All that happens is that once a worker's capacity is tapped out, they find workplace-acceptable ways to sandbag

Employers can seethe about it all they want but that's the reality