I think the limitations of the Doom engine work both against and in favor of the game, the enforced limitations kind of “distills” the levels to it’s bare minimum, pure creative level design, forcing the developers to work around those “barriers” as I’ve said, you can see this with older map packs like Scythe where the map makers were pushing the limits of what the engine could achieve. This is all somewhat lost nowadays with limit breaking source ports like GZDoom though.