You ever work on something so hard and for so long that even when it’s finally done you derive no satisfaction from it?
I think it’s like a bell curve. If something is fantastically easy, your sense of accomplishment is nil. The more time and effort, the more satisfaction you get when it’s done.
To a point. THEN things start to drop off. Eventually finishing the project at all yields no joy, and then why bother finishing?
(For the associated paycheck, obviously. But still, there ain’t much joy in that.)