I think most pepole try to get YAAM when they can.
Btw, it's not necessary at all, and may even remove some fun aspects of the game, since running through is something completely different, but clearing levels completely feels like one achievement.
Also, skipping monsters, like skipping (non-dangerous) special levels, reduce your char efficiency. Sure, lvl 3 or 4 can be enough to win the game, but lvl 18 definitely makes it easier.
And I got to agree with ZicherCZ : in a normal game, you didn't sign-up for respawning monsters. While I'd personally love having such a surprise, I know it would really be a bitch for someone not used to dispose of corpses, especially on some hard challenge. I'd be in favor of adding respawn only in N! difficulty but.... yeah, it doesn't make sense anymore :)
Simple suggestion : nerf the darkness event to reduced vision (-2). No headaches with map or respawns, just reduced vision, this looks quite fair, doesn't it ?