"If they are afk for the whole game, and hiding. You can see the name tag isn't it? Also you are saying they if they are standing still for the whole game. Then they are standing still at a visible spot to kill them easy. Sorry, but at this point, I don't agree with you."
They like to put something heavy on their shift button or just have a mod that toggles sneak, so no you won't be able to see their nametag then, but even if you're able to see their nametag there are plenty of places in some maps where it's still takes a lot of time to find them (EggWars maps). With standing still for the whole game I do mean that they hide somewhere first and then afk for the rest of the game, but I thought that was common sense.