There are degrees and differences in jobs that need to be taken into account. Obviously a store owner or manager probably need to be there and you can't manage

There are degrees and differences in jobs that need to be taken into account. Obviously a store owner or manager probably need to be there and you can't manage in half the time. But some roles (such as say programming) if you have X tasks a week and you get them all done in half the time and piece out in my mind that should be acceptable. It shouldn't be acceptable that if you get all your tasks done in half the time they just give you a bunch of other tasks until you work exactly 40 hours. And there are others that take 2x to do all their tasks so you end up getting half of their tasks. Being good at your job should be rewarded and encouraged and if that means saying "get all these done and if you get them done earlier and just as good you get Friday off" is a perfect motivator. I think the problem is people grew up expecting to work 40 hours and if you don't work 40 hours you're a slacker. And that can be true, but it can also be completely wrong.