Oh my god it's so crazy how times change and the fanbase changes along with them. Back in the Sims 2 days (mid 2000s) people were starving for medieval content (and a lot of fantasy btw as well). There were full modding websites to turn The Sims 2 into a medieval game. There were clothes, objects, worlds, everything you can imagine. I bet if you go to mod the sims 2 and go back a few years you will see it filled with medieval and fantasy content.
You know it's what the community wanted back then and it makes sense that EA decided to release a medieval spin-off for The Sims 3. I think it sold pretty okay too for a game with no promotion. Sims fans are different nowadays, not the same demographic The Sims 2 had, maybe that's why people tend to forget The Sims Medieval.
How times change, really.