>>717077773
Heretic has small contained carefully manually crafted maps. Adding "a little bit of Daggerfall" is like adding Daggerfall to Portal, you're ruining the very core of the game.
Now Hexen has more open nature, but once again it wouldn't make any fucking sense, "you've unlocked 1/6 of the puzzle" stretched over 30 minutes long procedural generated dungeon will benefit no one.