Countless times people get removed from a m+ mid-run or near the end, and therefore they get literally cheated for Artifact power and possible loot.
They spent food, flasks, time and repairs to get there - And then because of some honestly stupid arguement that occoured throughout the instance, the leader decides "Nope, you ain't having any of that".
This happened to me as of today, where i gave an advice to the tank (and the leader of group) in a higher level Black Rook Hold. It was obvius that he lacked experience in the instance, so as the more experienced player, i gave him a simple advice to ease the run. He replied with "Lol. I wanna see you tank this, Raging + Necrotic + Fortified"
This leads me to the question;
Why can you directly "remove" people from an active m+ keystone? You can't invite any other people to the instance anyway, and if people absolutely can't stand each other, they can just ignore the other. You could always leave if you fail it, but the ability to remove people is just outright plain stupid.
I'm not saying they should remove the "remove" completely, but only make it unavailable once the keystone has been inserted, so people don't get fucked over.