@surreality To a degree, yeah, that's a game structure issue although I think it's pretty rare that it actually legitimately gets that bad, and that when it does it's usually not because the role actually requires that much investment. When it happens, it's usually because of gross inefficiencies, ridiculous staff or unreasonable player demands on the time of others, etc.
For instance, take doing High General for a Firan war season. I'd say that was a pretty top level example in terms of workload etc: singular decision-maker, scheduling player rosters for missions to submit to famously ridiculous staff, and screwing up anything anywhere would get everyone killed and your name dragged through infamy. But... despite that, I'd say the OOC shit was probably mangable in 1-2 hours a night, and the 'required' RP could probably be boiled down to a couple scenes a week. Plus, a lot of it was the sort of thing that was fun for the sort of person who'd volunteer for it in the first place: strategic min-maxing spreadsheet foo, leading missions, meeting enemy envoys, RPing meetings, authority showdowns with a rival former position holder, etc. Firan-isms aside, I don't think it required an unreasonable investment of time. On the whole, I had fun doing it. War was always the best thing about that game.
But for the counter example, I got passive aggressively guilt-tripped by staff on Star Crusade playing basically the same character at a lower authority level (tier 1.5 noble where the game had only 4? I think tier 1s and the rest of the playerbase tier 2s or mooks) but not... I don't know, constantly RPing, submitting +request background actions, etc. My lack of constant RP affected basically no one (I had no actual PC vassals and communicated regularly enough with my own liege), but staff used it arbitrarily to take the high ground in arguments about their own poor management of the game's military storyline. Some of those staff arguments could drag for hours. It was tiring and amounted to nothing, fun the least.
So I think a lot of it really comes down just to shitty people who are either envious of other people having a shiny they don't (even if it's basically an intangible with no mechanical benefits) or staff using 'activity' to bully players and cover up for their own failings or poor organizational skills in terms of the plots they run. If a role 'requires' an RL job's worth of work, it's almost certain that there's some guilt-trip RP, overly long staff arguments, or other massive inefficiencies going on.