While I agree, many of us don't read what you mentioned, it would be cool if that kind of piece of lore didn't come from "side products". Obviously, you cannot put as many details on a Battletome as in a novel, but when those products with nice little bits are not part of their core products (they don't have the same treatment in terms of translations, for example) you are reducing their exposure.
So yes, IMO, GW is putting a bullet on their feet in comparison with how they did things in the past where even countries like Spain or France had their very own WD version with commemorative minis being 100% exclusive. They are doing also pretty nice things that they didn't before, but not all the community gets the same coverage in terms of accessibility to those efforts made by GW.