Players give away the position of their enemy to their teammates on ts3...because on certain 1up servers it is allowed to spectate the opposing team. This is bad because it doesn't teach player to listen or strategize against their opponent. Resulting in more players who never improve in skill. To me that is just sad and poor sportsmanship. There's my 10 cents. It's silly and ridiculous. Don't do that, it benefits no one long term only short term. Either way I'm going to pwn you, but ya don't have to be a loser about it.
I've been saying this for years, but nobody cared back then, and nobody cares now. I guess we have to accept it bourbs.
Back in my day though, before ts3, mumble, vent, roger wilco, etc, we used those strategies that you mention, but things have changed.