Tunnels are more confrontational then maps

I've noticed the lack of stealth options in tunnels and overall it feels very forced confrontational especially if you want to get to a specific map. In general i feel I have to bring more ammo along because I'm bound to go to a narrow tunnel and forced to unload on a group of enemies because i can't bypass them. Also due to the lack of enemies fighting each other (only seen a handful of encounters in tunnels) they're often focused on me.