Alright, I can explain this one to you, and I promise there is a very good reason.

If you start tanking in this game and you don't pull big, people are very rude to you. They will randomly exit the dungeon in frustration, they will run ahead and pull for you, they will say awful things to you.

That was my experience when I was new to the game 9 years ago. Once I completed all the dungeons, I started doing big pulls and sprinting between pulls. I aimed to respect my party's time by going as fast as possible.

I never had anyone be rude to me again except 1 time out of over 10,000 dungeon runs.

Most people want you to hurry up and respect their time. Not everyone. But the ones that don't want you to hurry up, usually don't mind that much.

If you want people to go slow, you're in the minority. If you were not, then I'd have been attacked in dungeons regularly for my big pulls. I have not been.

As a tank, you also feel a sense of responsibility to respect the party's time. They expect to just spend 16-20 minutes in there at most. If you drag it out to 30-50 minutes, many of them won't be happy.