Clapton developed a psychedelic aspect to the electric blues, along with a few others and to me, that is what he is best known for---- in the period between Mayall and Cream.
He also paid Skip James for the right to adapt "I'm so Glad"--fairly generously for the time, without arm-twisting as I recall.
I don't know about the moral high ground here. I do know there is a degree of presentism in judging the past by today's standards. If you are talking about current stuff, that does not take away from his historical significance as a player.