Every time people lament changes to the lore that amount to "not every member of species X is irredeemably evil" and claim the game is removing villains from it, I think how villains of so-caleld evil species fall into two cathegories: a) bland and boring and b)have something else, unrelated to their species going on for them, that makes them interesting.
Dragons are interesting as a species... They're also in the name of the game. You remove them and the game is just "Dungeons And."
In Pathfinder the "good" dragons can be just as fucked up. One set up a "perfect society" for humanoid races on an island, where the government performs eugenics and brainwashing and banishes anyone that shakes off the brainwashing
Eugenics is interesting from a dragon's perspective. They might live long enough to actually see the results.