One time I was playing Overwatch and I saw a Junkrat trap + mine on our door.

I warm the team there is a trap there on voice and text, and even joke someone will still trigger it anyway, and obviously, that's exactly what happened.

This is the same people Blizzard expect to me to coordinate to kill the enemy Mercy who is hiding behind the point.

That's why I'm glad with the PTR changes on Mercy for the res to be single target, not group, because if both teams are headless chickens running around, at least the team with Mercy will not be auto-win every time.