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
Also if its from the developers of the system you also, hopefully, can assume that they are keeping with their own visions and intentions which should be healthy for the system. Even if its just "Story" content, it'd be really weird to see a room full of random sci-fi crap in what has up until that point been mostly a gritty fantasy dungeon. Also, people can rail against this all they want, but people tend towards authority. The developers and publishers saying X feat or edge or whatever is useable in X setting, it doesn't leave a lot of room for inter-group bickering about it, but even then its opt-in.