Clearing the fight as a cooperative team and clearing it at the expense of your team are not the same thing. Sure, you got the clear, and I don't have to like you, but I want you to know I will expressly dislike you and think you're a poor player if you look down on our teammates if they were trying their best in good faith.
Clearing is only one objective. The other objective is having fun. Within reason, like all things, it's good etiquette to consider if you're impacting the experience of your teammates.
Much like they should be trying to learn and clear the content instead of wiping, you should be considerate of their gameplay experience when they're trying to do so. Within. Reason.
So yeah, leave it up to Square what's actually against the rules, but I'm glad I play every role and I've never thought once when tanking to have such a poor attitude and outlook regarding my teammates. I can't imagine Tanking and not consulting my party and conceding to consensus even if it IS bad idea because I care about my party more than a clear. If we have to do the entire dungeon again, who cares? It's a video game. I have a life outside it and a house to clean with limited time for gaming too so I understand wanting to make the most of what you've got. But if you think your 15 minutes matters more than theirs, yeesh.
If you want consistency, go in with a premade party or something. You get instant queue times and you know everyone you're playing with. Make a group in PF to run roulettes with all day, take job applications for your party, verify that skill level so you don't have to babysit or something. Run with your FC members. Go play with NPCs and enjoy some intended solo gameplay. Queue in by yourself both sync and unsynced and have a little fun. Tank solo content when you don't have dead people in the ground IS very fun!