Yeah, I don't agree. Again, I will point to the additions that 2e made to prior edition lore for monsters, and for most of the various campaign settings; and to a lot of the stuff added in 3e. The difference is when you discard old lore and pretend it wasn't there, or when you make massive changes that alter the tone, themes, and fundamentals of something. Changes that invalidate previous lore are not the only type of change that can be made, but they are the type of change that people are most likely to dislike. "Here's a new cosmology, your old one never was and doesn't count, even if it came up in your game" is a far cry from "Here's more information and expansion about the cosmology".