I'm faster on my own

 Or so Aloy says at various points in the game. 

Most of my play-throughs, though, it's really been the opposite. Horizon Zero Dawn is not quite Metal Gear Solid, or even Alien: Isolation but it really does help to use the stealth mechanics. Or, at least, to plan ahead, scope the ground, and lay traps.

One big reason is, oddly, that stealth is cheaper. You've got arrows that can take down a machine in a couple of shots but they cost a lot of resources to craft.

Stealth kills cost nothing but a little time.

That is, if they are spear kills. Which brings me around to the flip side of the equation. As in all games, the NPCs are dumb as rocks when it comes to combat, and especially the friendly ones prioritize getting close-up in melee -- that is, putting themselves in danger instead of staying up on the ridgeline sniping.

Thing is, the character design is so good in Horizon Zero Dawn I care about these characters. Fallout 4, despite liking several of the companions, I can stand to see them in danger (with the exception of Dogmeat. I'll always go to his aid.) Starfield, well, I've made my feelings clear there. But even with these games, there's an emotional grab when allies are in danger that makes you want to run out there and protect them any way you can.

Which usually involves running into the thick of things. Forget hiding in the bushes and taking carefully aimed sniper shots only when the conditions are perfect. Instead it is jump in with spear swinging. Or as Gordon Frohman put it, "Must kill with my fists because guns too slow!"