As I said elsewhere, I think Simmons has mental health issues because his availability traveled from Philly to Brooklyn, as I predicted it would. Deep mental issues can cripple your ability to be able to perform and/or even be available to do just about anything.
He is also using an undetectable issue like a sore back as reasoning for not returning quick enough. This helps him hide his mental struggles using his back as an excuse to not play rather than the mental health issues.
Looking back, seeing him not be able to reach his full potential, never getting better at all, moving on by "quitting" on his teams and not finishing what he started, this can all be effects created by not addressing his mental health earlier.
So, is it fair to criticize him? Sure, he is a public figure and he could have handled things much better, mental health issues or not. If his mental health has been bad going back to high school or college, he should have gotten help back then. You make poor decisions when in bad mental health and we don't know just how bad his issues are. His decisions over the last 10 months have been terrible, which would leave me to believe his issues run deep.
So if he suffers, I feel for him. However, if doesn't suffer, but is using this as an excuse to get his held money back, I think he is scum.