Help... My frustration with player HP

I've been running dungeon world for a long time. But one small thing continues to frustrate me...

Let's say enemies deal 4 damage on average.

A level 1 fighter usually has 25 hp/ 3 armor.

That fighter could get hit over a dozen times, without healing, and be just fine. Even if every enemy suddenly now ignores armor, it's still death by a thousand cuts.

How do you possibly "think dangerously" about that?

So, I've seen people ask this same question before, and the answers were just... baffling.

"Who cares! HP damage is boring! Read 16hp dragon!"

"Here's how you should play: The ogre only dealt 2 damage BUT... THE OGRE ALSO BROKE YOUR ARM AND YOU CAN'T FIGHT NOW!"

"Your shield blocked the goblin's damage BUT... GUESS WHAT THE KNIFE WAS ACTUALLY ACIDIC... AND NOW ALL OF YOUR GEAR IS GONE."

I've literally seen people advocate for a lowly bandit's melee attack being a PC instakill because "swords kill in real life and it's following the fiction".

Really...?

Okay, my question is essentially: If Dungeon World's combat is truly just the GM wily-nily making up consequences as they go... Then why even have HP...??? Why even roll any damage die at all??? Are the mechanics just there for decoration?

Sorry if I sound salty... I love dungeon world. I just get frustrated with the HP piece of it and the community's dismissive attitudes towards it. Maybe I'm missing something.