You mean online function for others to join you? Sims game has always been a one player game other than something like the sims online and mobile games. Sims Online flopped for a reason when it first came out. I don't personally see any merit in it. Sims 4 just wasn't built for that and it never will be. Perhaps the next game whatever it may be might have built for it.
Covid is over and people aren't stuck inside with nothing to do might have paid off by then. Roblox was built for online play and more. Though nowadays it's been rather unsafe for younger players.