Sixers aren't really in a super tank mode like everyone thinks. They just sign any veteran free agents since they weren't going to win this year anyway. They aren't tanking anymore then they were the previous two years when they were shedding themselves or all their veteran players. It's not like the NFL or MLB where if you have the worst record you get the top pick. Sixers of all teams know that, they haven't faired well in lottery luck at all. They certainly aren't banking on getting Simmons, they wanted Wiggins and Russel the last two draft and were able to get neither.
I'm not sure why they are so bad this year, maybe they finally gave up on their coach. They really shouldn't be this bad. Last year they won about 17 games and they figured to be a bit better this year. But..
-Nerlens Noel has gotten worse instead of better
-Nik Stauskas whom they were very hopeful would produce totally sucks
-Covington, Wroten, Grant, Sampson who all have the physical talent to play NBA basketball have shown no improvements, which I'd imagine falls on the coach