Yeah but this is easy to manage and predict. You tell everyone to do X work, where X is somewhere in the bottom quartile of productivity. If someone does less,

Yeah but this is easy to manage and predict. You tell everyone to do X work, where X is somewhere in the bottom quartile of productivity. If someone does less, you tell them to pick it up - it's pretty likely they're slacking off too much as opposed to being unable to perform. But you don't want people to do more, because then you start having different employees. Some would get jealous at others' higher productivity and more free time and you'll have to manage people differently and give different salaries and it will all be MADNESS. It's easiest for management if everyone is the same somewhat inefficient cog in the machine.