I think it's cool how often in the early days of Doom/Quake people would be like "yeah I made this map for single-player but you can play it in deathmatch if you want" because we hadn't yet honed the tropes of either design pattern to the point where they would seem mutually incompatible.
They might not have been good for deathmatch, but sometimes it's a fun novelty to just briefly frag each other in a space that wasn't built for it, and see how long until the cracks begin to show.
