So some believe. Nevertheless, we know Paul had trouble with his sight. Gal 6:11 says "See what large letters I use as I write to you with my own hand!" We also know that Paul dictated several letters to others rather than write them himself.
So again, Paul had an affliction that God chose not to remove.
MEGoody Galatain 6:11 says “You see how large a letter I have written unto you with my own hand”. Referring to the letter itself not the size of the alphabets used. And also remember Paul was in prison perhaps that’s why someone had to write for him. And as far as God choosing not to remove them, sometimes it’s up to you sometimes people choose to suffer, but you can’t say God chose not to. Just like in Philippians 1:21-25 Paul said he didn’t know whether to go be with Christ or to stay here, but notice the choice was his and he choose to stay here. Thanks