I would do that deal all day every day without even a moment of hesitation.
Philly fans should love this trade. Smart is every bit a great defensive force in the backcourt as Simmons. And Smart can hit threes and won't hit free throws in the playoffs at a 35% rate.
And they get Thompson and picks.
Simmons is the singular most overrated player in the NBA. I want nada to do with Ben Simmons. He is as good at 24 years of age as he was at 18. There is definitely something wrong with that that should make GMs not want to trade for him.
Simmons is a 6'9" / 240 lbs guy who has the athleticism, ball handling and play making skills of a high level point guard. He can play and defend all 5 positions on the court and do it at a high level. He's made the All-Defensive 1st team two years in a row, and was a legitimate DPOTY candidate the past two seasons. He's never shot below 55% from the field. He's got an absolutely elite ability to get to the foul line (49% FT rate) which this team desperately need. He's an outstanding playmaker with a pass-first mentality, which this team also could benefit from. He's absolutely deadly in transition - combined with Tatum and Brown this could be the best transition team in the NBA.
He's a high level rebounder. He's a terribly outside shooters yes, but unlike Smart (who is also a horrible 3PT shooter) Simmons doesn't have a tendancy to throw up contested threes 4 seconds in to the shot clock. His on/off impact stats as far as I have seen clearly indicate that he has an overwhelmingly positive impact on team success (+8 net rating, +2.7 BPM, +3.67 RPM). His size at the PG spot creates massive mismatches all the time.
He's also a three time all-star, while I'm not sure Smart is even truly qualified to be a starter.
Aside from outside shooting, Simmons is SO far superior to Smart in every imaginable area that trying to compare the two on anything close to an even level is almost laughable.
Also you criticise Simmons for his lack of development - how much has Smart developed?? He's gone nowhere in like 6 years. I thought last season he was finally taking a positive step, but then this year he proved that he's still the same old guy.
Smart + Thompson for Simmons is IMHO an absolute no brainer. I don't think there is a sane GM in the league who wouldn't do that . Even with the picks added I think that's a pretty easy call to make. But If Brad makes this offer to Philly, I'm pretty sure they laugh in his face.