Faolyn
(she/her)
This is true--but as I said, it kind of sucks for people who don't like the new lore but who still want new stuff.But if you are using old lore there is a magnitude more of it that's available on DM's Guild than will be published at all by WotC. So why look to WotC as opposed to buying the old lore you want from there
On top of that in order to keep lore 100% consistent they would have to reprint what's already available... including any questionable material they way want to rework (looking at you original Vistani). I can already hear the cries of scam and repackaging from the fan base.
Lastly there's no way everything WotC publishes lore wise is going to match or slot in perfectly with your own lore... even if it stays consistent, eventually some add on will contradict or not be to your liking.
For the most part, it's probably not a big deal. That a monster has a different origin now (such as harpies having been cursed elves) isn't a big thing. But people were talking about how goblins now being fey (a change I like) means they won't be subjected to charm person anymore. And as I said, this is going to be reflected in future products.
I mean, for me, the lore changes don't matter because I always pick and choose what I want, whether making my own setting or using an existing one. I make radical changes in even my favorite settings; like, if I were to run Planescape, I'd have by own planes and gods and everything and probably only keep the gate towns and Sigil (mostly) the same. But someone on this thread a while back even said that it would wreck things if, in the middle of a campaign, goblins were suddenly no longer able to be charmed (although as fey they can be repulsed by protection from evil and good, unless that spell was altered, so maybe it evens out). I have to imagine that there are other players out there who think the same thing--that they must use the new monster typing and accompanying lore right away.