So... Tell them you strongly prefer that they play without Glass Cannon/Lone Wolf, or else don't play with them? Just communicate better. And if you're are already communicating this, then isn't this topic is redundant?
Now if they lie and do it anyways, they're not worth playing with anyway. It's not like they're forcing you to play with them. Play with them, or don't play with them. Your choice.
If I very clearly stated that I want someone that is actually going to play and not some mindless player that doesn't actually play, then telling someone not to use something to adjust to my preference isn't them playing the game, it's me telling them what to do which totally contradicts what I just said.
I already said if they use it I just don't play with them.
So I'm not really sure what the point to whatever it is you're post is all about.
