I was in a small group and asked questions about this scenario about healing (adhd):
What if someone has adhd, which turns out to make traditional school incredibly difficult for them. God leads them into law enforcement instead, where their adhd actaully helps (in having hyperviligance and fast adaptability).
Isn't this a (rather visible) scenario where God would allow adhd?
Their answer: "Well God can take what the enemy meant for evil and turn it for good, but it doesn't mean that God allowed the officer to have adhd. God placed him there because of his character and that he was called to it, not becasue of his sickness. Knowing God's promise for healing is one of the basic things you need to know. 'By His stripes you are healed'. Why would he have died for us then?"
I think about people with nonverbal autism, people confined to wheelchairs, etc. other physical diabilities or chronic diseases - and it doesn't make sense why people think healing is promised on this side of eternity. Needless to say that shouldn't stop us from praying for healing, but it can definitely hurt people because of the implications (not enough faith, God is not sovereign, etc.). It also doesn't make sense because everyone gets sick will die (even old age is just an accumulation of bodily failures). So how/why would they believe that?