I think a lot of people are taking my suggestion too literal, it doesn't need to be a medieval period setting as in out of time with the Sims 4 - but rather a fantastical location with an old world visual aesthetic. Think Harry Potter for example.
Perhaps some forgotten corner of the world with whimsical architecture where the local inhabitants dress in old style european clothing.
A fun place to visit as tourists - which would also allow the Maxis team to put a block in so non realm of magic residence don't go walking through dressed out of the local style.
To the extreme it would allow players like me to simply remove the more modern aspects with some simple world management and bingo I've got my medieval world too now. But its not a different game set within the Sims - just another strange corner of the world OF the Sims 4 with some magic touch.
