If that boulder is making
ros a Beorian word, for example, Tolkien
can "lift" it, but doesn't. And he goes on with a note concerning the word wing:
"noting that the name Wingelote of Earendil's ship had not appeared in print." A few pages later [POME] Tolkien muses whether or not he can make Glorfindel a Sindarin prince -- but no, this would entirely contradict what is said of him in
The Fellowship of the Ring.
It's art. And it's for a readership at large (including future readers), and up for criticism; and yes, this reader (me) sees no great reason to alter Finrod, and thinks Tolkien should have created around it.
Anyway, it's not like I throw my books into a swamp when I read Finarfin in Appendix F!
Not anymore at least. That got costly
