In my country, Sweden, one of the most popular RPGs used to be Eon and that game i s much more medieval than DnD and it is very playable. I would argue more so

In my country, Sweden, one of the most popular RPGs used to be Eon and that game i s much more medieval than DnD and it is very playable. I would argue more so than DnD, that that is subjective. And it was a very popular game so your guesses are wrong. There are also a whole bunch of the games which are semi successful which are more or less about medieval life, e.g. Pendragon. And then we have Warhammer Fantasy which is renaissance. DnD is mostly just big in the US due to historical reasons.