I've thought about this a lot too, but I'm not sure how good we would've been. Is a lineup of Conley/Sexton/Bogey/Markkanen/Gobert really better than Conley/Mitchell/Bogey/Royce/Gobert? Obviously Markkanen is a better player overall than Royce, at least offensively, but Sexton isn't nearly as good as Mitchell. Seems like that team is destined for a first-round exit just like last years team. I guess we possibly could've used the draft assets we got in the Mitchell deal to trade for another star to play with Gobert, but I'm not sure who that would've been, or if it would've worked out any better than Mithell and Gobert did.
Gobert is one of my all-time favorite Jazzmen and I believe he is the 3rd best player in franchise history. At the same time, I also believe he makes a much bigger impact in the regular season than he does in the playoffs. He's also on the wrong side of 30 now, and big men in the NBA tend to age faster. Given the unbelievable asset haul we got for Gobert, and given his age and contract, I think we made the right move.