The people who understand you tend to be the people who share your views. When someone is sceptical, they don't tend to get what you're saying right off the bat. But someone who engages with you is likely trying to understand, rather than dismissing you out of hand. They very likely don't know how specific they need you to be, and probably don't really expect or want you to write them a novel. They've asked a few specific questions. Perhaps you could just start there?
I mean, I sort of get what you mean, and partly agree. But it wouldn't hurt to go a little deeper. I'd like to see you answer their questions.
I don't think the issue is quite as extreme as you appear to think, but that's pretty par for the course. WotC is trying to get through a LOT of material with very few books published per year, and very few pages allotted to each book. Given that, I think they could do better than they have with the depth of the lore, but I don't know if I'm right about that. It's very likely not as easy as it looks.