I have no idea why you seem to be insulted by WotC, or anyone else, publishing things that don't affirm your own RPG preferences.
I mean, I'm not insulted by 5e D&D in general, or its GM advice in particular. I just don't play it. I wasn't insulted by 3E being (relative to my preferences) a pretty unplayable RPG. I just didn't (and still don't) play it.
The world of RPGing is a better place for Worlds and Monsters having been published. It sets out a coherent vision for how the accreted fiction of D&D, particularly its planes and their inhabitants, can be used in a playable game that will produce, in a reliable fashion, the "story" of D&D - that is, the story of a group of heroic adventurers who start out defending a village against Goblins and end up confronting the Demon Lords and evil gods who are responsible for the ills of the world.
Perhaps that game is of no appeal to you, but I can't say any way in which WotC publishing it, and advocating for it (given they are trying to sell it as a commercial publisher) is an insult to you or anyone else.