i’m very happy in the “terminal” senior position at my company, there are higher levels but it’s fine to stay at the level that i’m at forever. i don’t need to pick up extra work because im not trying to get promoted and i can usually get by just by having smart sounding ideas in meetings, helping figuring out the more ambiguous tasks and just doing enough to meet expectations. the expectations of the higher levels seem pretty unpleasant , and the guys at lower levels than me are happy to pick up extra work because they want to get promoted lol