I've never thought of a PR as causing conflict. For sure, you're right now that you've explained it, but as an engineer I've never felt that way.

But I'm okay with the conflict! There should be conflict at work! Ideas should be freely expressed and those ideas are going to meet contrary ones!

What wouldn't be healthy is a place where that conflict isn't resolved or doesn't lead to a better idea winning. Or where only the Lead "wins" because of their position.

There shouldn't be arguments, no one should yell or be hurt. For sure that's a bad place to work. But conflict about where to place a piece of code? Sure! Conflict about if we name it Foo or Bar? Why not?! That conflict is like the sharpening of Iron! It hurts _today_ but can strengthen and make _you_ better let alone the organization as a whole.