B4: The Lost City is a classic module for D&D. At one point it (in)famously stops giving full description of the rooms but instead lists monsters in each area and tells the DM to figure out why they're here themselves. Once the reprint will show up in new anthology, I'm sure people who complain online whenever WotC uses "ruling not rules" or "DM decides" or "these parts were left for the DM to fill in" in their design (and then continues buying WotC books to keep bitching and doesn't touch 3rd party or other games for some reason) is going to be normal about it. /s
Then why are you still buying from them? It was well-known they do this before Spelljammer, why did you keep buying?
Oh I'm not. I don't even play 5e anymore unless someone else is running it. I moved my setting and campaigns to Savage Worlds.
I did so because I don't like that WotC sells me books that are half baked and claims it's up to GM to write the content they paid for.
Also the entire debacle the other year with the OGL.
Spelljammer and the OGL were what drove me to GURPS.
I don't need a book's permission to use my imagination. I buy a book to have play tested and balanced content.
Yea this is 100% the issue here. If I wanted to make content, I would, if I purchase a book with content for a specific setting or scenario, then there had better be that content in it.