From what I'm seeing, the most senior people are sadly all over the place as well. Because they know a lot about different subsystems, they're often pulled in to help on them (it's partially the consequence of aggresively growing the dev team - there's a lot of arcane knowledge required to be efficient and most folks are too new and don't have it). So, the seniors' jobs do not look fun at all. But yeah, maybe being a senior on a more stable team could be fun.