Why?

I'm going to use my time in Crucifixion woods as an example.

I wander in. I go about my business and I get invaded.

"Oh no worries."

Invader immediately runs to giant crabs / Yellowfinger / guys guarding Farron keep.

"Well that's slightly annoying."

Invaders backup arrives.

"Yes. This is completely fair."

Now it diverges.

A) I fight two invaders, mob enemies and a dark spirit. I DON'T pot.

Result: If I win, "OMG YOU HACKING FUCK".

If i lose, "OMG YOU SUCK SCRUB HAHAHA".

B) I fight and DO heal.

Win, "OMG FUCK YOU YOU SCRUB."

Lose, "HAHAHAHA FUCK YOU SCRUB".

Yes. I have my full health and more potions. But I also have all the enemies, two invaders and can expect a steady stream of bullshit either way. If YOU invade someone else you do it knowing you are potentially going in at a disadvantage (I.E less health, they cleared the zone and are waiting to gank you). If you decide to this you don't get to complain. The balance can rapidly swing back and forth during a fight which is the essence of DS. One mistake fucks you.

Working as intended.