People are praising her for being brave/heroic because they thought it was about her mental health but we now know this is not a mental health issue. It is a mind/body disconnect. A true physical issue, like a fractured bone, where she literally could not compete no matter how bad she may have wanted to, without risking her life. That's not brave/heroic. That is smart and proper and what should be expected of anyone in that situation.
I agree with Tweb in that they did a very poor job of explaining the situation at the beginning. If they had come out initially and said that she is having air awareness problems, which was clear in the vault videos, most of the criticism about her quitting and being soft and can't handle the pressure would not have happened. We can all debate whether that should matter and whether people should be kinder, and we should all try better. That's all very well but we are dealing in reality and how news is relayed has a lot to do with how people react to it.
as for Simone coming back to worlds or in 3 yrs, I am doubting it. She is on record saying she doesn't enjoy the training anymore and that she is doing this for others, not herself. Sounds like she is ready to find her next passion - that may still be in the gym world, just not the high level training/competing.