[Razengan]

Yes, not saying Doom isn't awesome, just that it would be nice to have games where you just fight without worrying about any distractions.

e.g. instead of hunting for keys or cards or levers, or trying to spot secret entrances, they could replace that "artificial" complexity with improved monster AI: Learning enemy patterns and having the enemy learn ours in turn, using a destructible environment to dodge or assist attacks, and figuring out how to deceive their virtual senses (like throwing an object to distract them) and so on.