Earlier quoted context omitted.
He did it so well that most "high" fantasy that came out after him felt derivative of Tolkien. I'd really like to see counter-examples though; I feel like I haven't dived into the genre enough, in part because I'm turned off by the sheer volume of some book (series) on the one hand, and the juvenile tropes (generic hero's journey formula) on the other.
One way to avoid Tolkien’s shadow was to branch into related genres. Cue weird/ubran fantasy (e.g., Perdido Street Station), historical fantasy (e.g., The Spirit Ring), or pseudo-fantasy (the Ghormengast series, The Buried Giant). Interestingly, it seems that only works from last category have some real literary value.
A lot of it is very Tolkien-esque, given Tolkien's influence on D&D and its influence on RPGs that followed, but it has a different feel than the fantasy of the 70's-90's that lived deep in his shadow.