Morkus from Orkus
Hey. If the book store is only going to charge me for the bits that I'm going to use and not all the huge amounts of fluff and adventure that I'm not going to use, I'll be more than happy to buy it. That's not generally how it works, though, and I'm not going to waste my money like that.I mean, I clearly see that you want more books like Tasha's/Xanathar's (and you're not alone there, they are probably the best-selling books after the core rules), but that doesn't mean they're the ONLY rules that exist, and that rules that are in books that contain other things like adventures/fluff are entirely irrelevant.
I saw your criticism of the Eberron book earlier, in that you'll never run your game there. I mean, so what? The book has a ton of rules (and I consider monsters an extension of the rules) and you can use them in your own homebrew game.
Or Ghosts of Saltmarsh, which is part adventure but also provides rules for ships, maps, tables and other content to support a seafaring game. You don't have to use the adventure, that's all useful stuff for a homebrew game.