As far as A goes, I agree. I do play Old West, and Sci-Fi, though both are fantasy as well with the latter being Starfinder, which is science fantasy.
B and C, in general I agree at least, but I'm a bit corner case, like some, in that I sometimes seek distinct historical cultures and delve more deeply, seek more nuance, and in a sense achieve more historic accuracy, despite operating as a fantasy setting. Noting of course, like my Kaidan setting of Japanese Horror (PFRPG) which is set in a feudal Japan analog, it's not Japan. So doesn't have to cleave to every historical aspect of Japan, even though I tried to be as authentic as I could in it's development.
In a previous personal setting, I ran a 8th century inspired Vikings, Anglo Saxons & Celts England analog campaign, which I limit access to weapons, armor and the technologies of the time. So while my personal and published settings are fantasy, and often cleaving to some historical epoch at least in inspiration. I know most people aren't so specific in their "medieval fantasy", but some people, like myself, to a degree are at least moreso.