I had a situation like that years ago. I stuck around long enough to build a very comfortable cushion, quit, and then spent the better part of a year afterwards

I had a situation like that years ago. I stuck around long enough to build a very comfortable cushion, quit, and then spent the better part of a year afterwards being very picky about jobs and eventually landing the most rewarding, most purpose-filled job I ever had. Honestly, it's a luxury very few people ever get in their lifetime: having enough experience and enough of a financial cushion to really connect with their sense of purpose without worrying about daily expenses. If this job gives you that, I'd highly recommend taking advantage of it if you can. On the other end of the spectrum, staying at a job like that will eventually whittle away at your sense of purpose as you mentioned, and what's the point of having all that cash if you spend most of your waking hours feeling useless? Not to mention how quickly your skillset will become stale if you lose your desire to improve. At least that's how I looked at it :)