(A) ymmv, but that’s how these things work.
(B) probably not, but it doesn’t mean that the episode as presented on screen wasn’t leaning hard into the Bridgerton thing, and there are aspects which depend on at least a passing familiarity.
(C) there are ‘usual quarters’ and there are ‘usual quarters’ and people will put anything into that definition that they don’t agree with, just to shut down disagreement. And it must be truly remarkable a character in Who history that was universally loved without any criticism or bad reaction. Even the Doctor doesn’t get that status usually.