I do not think they are annoying. For big announcements like long hiatuses or major changes, I actually prefer them. It kind of ensures that people will see them. Notes on bots can either get ignored or just get lost in the description (we all know some Jani users have issues with reading comprehension, lmao). Naturally, if someone is constantly posting them, it might get a bit annoying—but again, big things, in my opinion, should be announced properly!