Why is doing things as fast as possible bad?

[DuelingPokemon]

Hate speedruns. WoW made me wanna burn them with fire and the attitude that typically comes with them makes me sick to my stomach. ><

I only do it with a group that:
Knows what the heck they're doing.
That all of us have done the dungeon at least once or twice
Are GEARED for the dungeon
Have a good attitude
Can have fun with it

Im not going to rush it just because you have to potty in fifteen minutes >=/

[Adler]

There is nothing wrong with doing things as fast as possible. The problem is people that want to do things faster than the party is capable to - often the very "I want to speedrun this" member is the least capable person in party to do a speedrun.