I can't do anything about players choosing black as a color and blending in, that's Blizzard's fault.
As for the creeps, I made that choice. Again, I want people to talk, and ping. It is a team game, and if you're not thinking like a team, you're not going win, or even have fun. You'd just be going through the motions.
To fix it, I would have to use an actual player ( reducing the number of possible players to 11 or less ) as the enemy. I don't want that, didn't plan on it, and didn't design for it at all. So this will remain.