Also it seems to add a context to chess that helps the amateur identify their weaknesses, both tactically and strategically.
My brother who couldn’t get into chess , that he “didn’t get it beyond the basic moves”, has said understanding that there is strategy involved makes the game interesting to him. So there is that aspect also.
He has recently acquired the Yusupov chess course books. Will they help him? I'm not sure if he's quite ready for those, yet. He still needs lots and lots of tactics practice.
They are way over his head.