Make penality system for dungeons of any difficulty and raids which will dont let player enter to instance if he failed multiple times mechanics and in that way he harm his team mates.
No, being unskilled is not a crime.
I met people with 2,5k rio and higher just dont do mechanics only because they want to slide trough instance while rest of group break fingers on rotations to save them.
And when it is abused in new dungeons where people are learning, but others expect perfection in normals, then what?
A better solution would be to do something about boosting , so people can’t get to high Rio while being clueless. Maybe making the score dependent on completing each dungeon at each level, rather than max level it has been completed at might help? So to get score from a +3 you have to have completed that dungeon on +2. Not perfect but it might help.
There is never going to be a system put in place to measure skill, especially one where the complaint stems from an outside tracking site for performance which is already cheesed by boosts. If it’s a pug, you have control it’s called remove from party. If it’s an lfr or lfg system vote kick and if it’s a guild then it’s a community problem to speak with and handle it