Agree. The problem is the incentivization. If a painter paints a roof in 5 hours but could do it in 1 hour just to get paid for the 5 hours its not the worker at fault but the system. If the painter got paid for the 5 hours but only did 1 hour of work then everyone wins. The painter can have more time off work or work more for more money, their choice.

Likewise the office worker working 40 hours per week, five days a week. If on some days the worker can come home early because they completed what actually needs to be done then that is better for the worker. But instead companies have a fixed 40 hours + overtime expectation. On the weeks with less work, people do busy work but instead could be using that time doing what they want.

Again the problem is the incentivization.