I suspect that there are a lot of DMs that was depth and world building but many of them want to, do their own world building and those that want to import world building have found a third party source.I feel you. I get tired too. I took a long break from DMing recently because it was making me angry, actually. But I can't believe that I'm the only one left who wants depth and worldbuilding in D&D.
You are not going to get world building from WoTC ever again. It is market splitting and they are too big tent to want that.
Canon is divisive, it becomes a barrier to entry of newbies and is off putting to people that do not like the lore.