Comparing anyone to Tolkien is massively unfair. Tolkien was a seasoned linguist and he worked on LotR for about a decade. It is going to be extremely hard to match these expectations for other authors.
This actually understates the effort Tolkien put in. He'd started the world-building that led to LoTR approx 35 years before the publication of the first volume (in 1954), specifically by writing the first tales in the Legendarium we now recognise as The Silmarillion. And he never actually completed the latter even having spent almost 60 years working on it.
I guess you're just a huge fan of Tolkien?
In which case, have you read https://archive.is/20241231024916/https://www.newyorker.com/... in which Michael Moorcock calls Tokein's work:
"...a pernicious confirmation of the values of a morally bankrupt middle class".
Which I'm not saying should change your opinion on anything, I just find it's always a good exercise to find the juiciest criticism of one's darlings.
it happens to with Tolkein. but it's kinda like claiming a compiler optimization specialist is a good video game developer simply because games use compilers.