It's a weird thing to optimize for. If you care about availability for work you can just pay more where it feels limitless and never look at the limits. I think a lot of people have a tendency to want to minmax as a "game". I also occasionally have the urge to do it but then realize it's a means to an end, not the end itself. I would feel good having maximised usage even if it wasn't productive usage which is irrational.

I think the main problem is the usage limits. You would never feel like you are saving money by watching movies on Netflix. If they didn't have limits, many might find themselves using agents less actually.