Something that's weighed on my mind for the past 6 years: when I graduated CMU, in a speech the head of the CS department told us [paraphrased] to work on things that matter and to be a force for good in the world.
I never felt like I've accomplished that. I also don't know what I would work on if I did have the means to chase some deep work without worrying about money.
I guess if I could get paid to do anything I'd probably do something silly like write a new programming language built for expressing mathematical proofs. These exist, but I've always been interested in starting from the UX side (how do I like to write proofs on paper) and working from there to a formal language; instead of the cutting edge research that is often the other way around (here's homotopy type theory, now let's unify it with modern math)
Now the question: even if I had the means to do this while continuing to pay my mortgage, would this be doing any good for the world? Would anybody care about the end result? Would I regret it after 20 years?
Edit: I guess the crux of the issue is, it's hard to optimize for being a force for good because the world is big and complicated. But it's quite easy to optimize for making more money, you just go down the list of top paying employers on levels.fyi and filter the ones you don't like.