Why can't we have the ability to create accurate Parser?

[Zakalwe]

Wrong. DF is for people who don't have a lot of time to devote and want to get a quick dungeon in.

When I roll in as a tank, I'm expected to know my class, know how to keep threat, know every boss, know where to lead people, know where to position mobs/bosses, and know when to interrupt/stun things. Failing ANY of these, I would get vote kicked, harassed, and bullied WITHOUT THE USE OF A PARSER.

Why is it then the moment a damage class is in question as to whether or not they're playing their class correctly, it's this giant problem?

If you get vote kicked, harassed or bullied for not being a perfect tank, that is an abuse and you should report it and bring SE's ban hammer down on the jerk. What you shouldn't be doing is wishing you had a tool to help you do the same to others.