Alternatively, I've worked with Staff Engineers who are still fixing bugs, and also building (maybe staff-level?) tooling and project improvements. The most significant issue is the lack of standardization of expectations. "Staff" doesn't mean anything in a vacuum because it doesn't mean the same thing between any two companies.

Personally, I love doing senior stuff. I don't know if I even want to be staff at any point, maybe I'll want a different challenge someday, but I still get a lot of enjoyment out of churning out high-quality code and shaping things at multiple levels. But if I stay where I am, I'll eventually be promoted to staff with minor shifts in the work I do.