I don't disagree that C S Lewis and J R R Tolkien had very different approaches to fantasy worldbuilding, but not in the way folks often claim. "Lewis put Santa Claus in Narnia because he didn't give a shit" well, no, C S Lewis had a complicated but entirely self-consistent answer for why Santa Claus is in Narnia that somehow manages to involve multiversal time travel and just didn't bother to bring it up until five books later, and it probably wasn't even an ass-pull because his claim to fame before Narnia was as an author of theological science fiction. Lewis didn't annoy the piss out of Tolkien for lack of trying, is what I mean to say.