Dota 2 DOESN'T need a concede option, but...

In the same vein of when someone stays still for too long (for 5 minutes or so) if the enemy team is fed and is literally just sitting at your fountain behind towers/ancient farming you for 20 minutes, there needs to be something done. It's more common than it used to be, and I don't know why people are doing it because it's insanely boring and a big waste of time.

If someone had DCed from the game, then you can just leave without repercussions.
You can also just do nothing and let them push.

If the enemy team is fountain farming, they had taken at least 2 lanes' barracks, so the match should be over in about 2 minutes.

This is just me, but I like it when people fountain farm. Whether I'm the one doing it, or the one camping in fountain, I don't know why, but I like it.

If all five players disconnect, the game will instantly finish and no one will get punishment. It's like a surrender.

^ True, but then the team that disconnected wouldn't get battle points and whatnot.

Still better than waiting 20~ minutes and getting abandon if you leave the game immediately.

Also, who cares about battle points and items? they do not improve your skill

I agree with hades

I like fountain farming but I am always the one getting farmed when my teamates leave :(