Just because Philly finally made the playoffs again, does not mean that a rivalry is back. The Celtics are missing their two best players and are still up 2-0 in this series. I think the Bucks were easily a more talented (and better) team than the 76ers.
I don't think Milwaukee is more talented, but the playoffs are different, and the format favors players that can impose their will on a game. Philly has better role players, but Giannis and Middleton were impressively tough under pressure, while Embiid and Simmons aren't ready to consistently do that.
This should become an epic rivalry. The 76ers are good now. They've got a #1 pick sitting on the bench that still might become a great player, and they might be able to sign a top free agent this summer.
The good news for us is that our young core is fearless, while their young core seems very fragile.