My reason is different from most. I am working on difficult problems, more technically difficult than I ever have before. Maybe I will succeed, but I may fail because I'm way in over my head.

But if I am in over my head, I hope I get fired. Because at least I was challenged enough where I hit my limit for the first time, from a technical standpoint. And then I will be free to move on and do something else with my life.

If I succeed, then I will be happy continuing to succeed in this role, working on difficult problems. So it is a win win.