Co-op play is SO important these days for dungeon crawlers. It is almost the norm now. Co-op also allows proper SOLO play. Descent got with the times with it's Road to Legend app. Doom better do the same otherwise it's a no-go for me and probably A LOT of other board gamers.

Who else here agrees that a Co-op app is very important for this game?

It would just be an entirely different game. There's 1vMany games, and there's co-op games. It's not "co-op play is SO important these days for dungeon crawlers", but "many dungeon crawlers today are co-op".

Doom isn't co-op, and it doesn't compromise any of its 1vMany mechanisms for a co-op variant. I like that. I have plenty of co-op games for when I want to play co-op.