Not in an FU sense but still something of a different angle from what I have seen, just inspired by the poster above mentioning turning down jobs in retirement:
A family member came to me the other day with a proposal that I take over their franchise when they retire. I'd helped them work on it in the past so I know an idea of what's involved and also how much money they ended up making once they were successful.
The franchise, if continuing to be successful (and I have imposter syndrome big time, so I'm not even sure I could keep it going), would general about 100k-200k gross. An enticing amount of money!
However thanks to MMM, and other financial forums, I realized that even though I am currently making sub-100k, it is a stable public-sector job with a solid pension, 457b, great health insurance plans, amazing supervisor and work-life balance, really generous time off, etc that I would be happy to continue until retirement with very little risk!
Oftentimes I think many people just look at the salary, but there can be other slightly less tangible benefits to a job that those not actively reading these types of forums may not think to count towards the benefit of their job. So maybe this is more of an FU knowledge, vs an FU money (but again not in an FU kind of way just the freedom to make decisions based not on money but what works best for our lives).