Here is a list of who PHI drafted as a result of their multiyear tank (5 top 10 picks):
2014
#3 Embiid
#10 Payton
2015
#3 Okafor
2016
#1 Simmons
2017
#1 Fultz (Traded Up)
I think this proves is why tanking and planning to build your team through the draft is a bad strategy, or at best a risky strategy. Drafting is very hard thing to do. You pick a player you think will be good, and it turns out to be a bust.
The Sixers could have picked Porzingis, Lavine, Brown, and Tatum instead of Okafor, Payton, Simmons, and Fultz but no team is going to end up with the perfect pick every time. Their plan was that they would have so many high picks that they would get enough right to end up good.
It simply did not work that way for them and does not work that way for most teams that go that route. Now if they can get something decent for Simmons, say McCollum, they are not all that bad off in spite of all the bad picks and other mistakes. But it won't be the direct result of the tank which was blatant.