Duke Nukem 3D's renderer is sector based, not BSP based.
There's a lot of room-over-room stuff going on that a BSP system like Doom's couldn't represent.
You may have noticed that Doom has a lot less verticality.
Yes, there's staircases and platforms but you cannot willy nilly stack floor planes on top of each other.
Given BSP is still a struggle, I don't see a sector based renderer ever happening on Genesis.