Tangentially related, but I found this article on positions that humans understand better than engines fascinating: https://www.chess.com/article/view/10-positions-chess-engine...
Especially Hikaru's game where he "outsmarted" an engine.
At the very least, it shows by proof of existence that humans can augment engines in some corner cases.
On the topic of combined human/engine chess, this is something that does exist https://en.m.wikipedia.org/wiki/Advanced_chess. It hasn't really gotten any serious traction, but I think it would be something interesting to see. I suspect that chess engines are so far advanced now though that humans would add nothing.