Honestly in almost every MMO the default leader is usually the tank. Not because of his skills or leadership qualities, but because when he turns that corner to see a room full of mobs aggro him, he wont die. Because he know he can take hits before the healer can pop a cure. There is a reason we use tanking classes. If the tank doesn't want to do something it could be because he can't or because the healer can' keep him alive. Not anything to do with the dps and how fast they can kill as a group. And if the Tank can and maybe just doesn't want to, then you have to consider why you are not doing the run his way, is it because you don't want to? Can you say he is being selfish when you are being the same? This applies the same way to tanks forcing speedruns.

Honestly I have no problems with WP speedruns, what bothers me is AK speed runs because they involve death pulls. That is right, its the tanks job to pull everything and die while the party moves up. And I don't know about the rest of you but I play the game to fight and tank and dying is the last thing I want to do. So why would I force it to save people a few minutes and lose money to repairs. Why would I do this for people who aren't even polite enough to say "Hi" at the start of a dungeon, or "thanks for the run" at the end. Especially if you did do a death pull. There are several threads of people complaining for more content yet here they are trying to use shortcuts on the content we do have.

Sit back and enjoy your game.