Why does everybody hate the idea of multiplayer in TS5?

I feel like if they do add a multiplayer to the sims 5 it need to be optional, and give the players the ability to run their own servers. I don;t want to play with a bunch of strangers, but if me and my friends could have our own little private world I might play it. Single Player has to be in the game I feel though. And it need to be the main focus. The game should come out single player first and update a multiplayer later once they make sure the single player game is what it should be on release.