This is why Ben is such a poor FT shooter. This offense is alot like
the Cola's gameplan of Ben standing around and watching everyone else shoot the entire game with the exception of the occasional lob or put back. The last two seasons, with Ben as a more often included piece of the offensive puzzle, he was becoming more comfortable as an offensive player and we saw his FT % improve.
However, now that we have gone back to being a strictly jump shooting team, Ben hardly ever gets an opportunity to toss the ball at the basket, hence, no offensive rhythm or ability to get a feel for shooting the ball in gametime. Needless to say, dunking off lobs does nothing to improve your form or follow through or give you any repetitions to get comfortable with.
I know some fans would rather Ben never shoot the ball in gametime unless he's tossed an 'oop or picks it up close enough to jam. But, the decrease in foul shooting will stand as long as he's not involved in the offense.