Corinnguard
Hero
How would the reverse be better for D&D? Every world having elves who don't speak the same exact way. It would certainly lead to some interesting role-playing. You could have two elven characters from two different elven cultures trying to understand each other. Presumably with a Linguistics skill and Insight skill check every now and then. Beyond that? Who knows.Moving the languages into cultures helps, to some degree. At least now everyone raised in the "Deep Dwarf" culture knows common, undercommon, and dwarf...
But what is "Dwarf" as a language except an example of a racial monolith spoken across the dwarf-related cultures?
The VRC cultures all give you "Common, plus another language" or two. Or three. Or whatever. But what are those languages? Dwarf, Elf, Auran, Gnome, Minotaur...
Which are the same across every planet, because no matter how far apart elves are in the galaxy they all speak Elven in the exact same way.
It could be that they all speak Elvish the same way because their gods wished it to be so. For simplicity's sake.