We have plenty of time to hear what these "so many reasons" are.
1. It was clear as day the celts did not want fultz. They want jackson or tatum
2. The sixers are the only team in the nba with enough assets to actually trade for the first overall pick.
3. Believe it or not the sixers had the upper hand here. we basically traded a top 5 pick to leap frog a team. that is terrible value.
4. The reason why it was terrible value is something important to consider. While the sixers have accumulated a ton of assets lately we still don't know what we have. Embiid looks like a generational talent but can he stay healthy? Will Ben Simmons be effective without a jumpshot in this league? Instead of staying at 3 and potentially having lonzo ball fall into our laps or have the choice between tatum and jackson. Two players who could turn into important pieces if embiid or simmons fail to become who we hoped they would.
If the sixers had the first overall pick I would pick fultz , but i do not believe he is worth the risk of giving up a great future draft pick.
The sixers did ok here out of a scale of 1-10 they probably did a 4. what really saves them are the restrictions of the picks.
The celts on the other hand got 10/10. They got a great future asset for apick they did not want, and they will still end up getting the player they want .
Going forward the sixers have no known quantities. And giving up a future top 5 pick is not what you do when you have such a wide open future. If we were a fultz away from being contenders it makes sense but we are not.