"Our key point of difference" I believe this is what it's about.
God never changes. What he did then he will do now. Strange is it not that the bible says "God (Jesus) never changes" and when he was here everyone that came to him got healed. Yet now, today God has changed and if we come to him he might let satan give you sickness or might not. God forbid...Oh poor Job, read what happen to him in the end. You never hear that. He got healed and had twice as much as he had before. Gee it looks like the two might go hand in hand.
Side note: Paul and the thorn in the flesh. The 'messenger" greek 'angelos translated "angel 179 times and messenger 7 times. It is never translated "desease or physical infirmity and never means any such thing. I believe Paul's thron must me understood in the same sense as Nu 33:55, Eze 28:24; HO 2:6 where the same Greek: skolops thron. And Buffet: greek "kolaphizo" to cuff or to box on the ear, Mt 26:67, Mk 1465; ICo4:11, 2CO 12:7, 1PE 2:20.