You're reinforcing my point, my guy.
What you say is - yet another - big, red flag attached to Simmons. When you talk about "getting [a player] back up to X%" you're usually saying, give the guy rest, some time, work on his mechanics, etc. And it's usually small percentage variations. With Benny, you're trying to surmount a drop of 36% in FT%, completely inexplainable beyond the simple fact that he doesn't have the mental for ude to improve his game in the playoffs. Literally no other outside variations (we're not talking pull-up % or contested shot making, where defenders, matchups etc are factors; it's literally free throws). And then, you take into account the fact that teams were literally Hack-A-Shaq'ing this guy, because not only could he not punish teams for it, he got disgustingly worse at a basic part of the game under pressure. You think teams are gonna stop hacking him just because he's in SanAn instead of Philly? no.
The book on stopping Simmons is out in the open for everyone to read. Every single team took notes (actually, smart teams have been taking notes for years now, like the Celtics). Unless you're thinking of a sports psychologist (which I have the feeling Benny won't take too well getting sent to), it sure as ain't as easy as "getting him back up to 70%". The problem lies far deeper, deeper than SA can realistically hope to fix.
Damaged goods, as they call it. Dead end. Whatever you wanna call it.