Excellent, parsers are now bannable

[Niwashi]

Sure you can measure dps by seeing how fast the encounter goes but there are twice as many dps as there are tanks or healers so their performance are not as easily estimated.

But that is the part of their performance that matters to the game. If the mobs are dropping, the DPS are doing their jobs. If party members are not dropping, then the tank and healer are doing their jobs. Effectiveness is seen in the game itself, not by some number a parser could spit out. Parsers are just a distraction from the more important and useful measures of players' effectiveness.

if using a parser is bannable offense than Yoshi p would have said using a parser, even when no one knows that you're using a parser, will get you banned.

There's a difference between breaking the rules and getting caught breaking the rules. Using a parser is against the rules regardless of whether you say anything about it or not, but SE has no way of punishing someone for a violation unless they know about it. The only way they'll know that you're breaking this particular rule is if you tell people that you are, so that's the only time the rule becomes enforceable.

[Sacred-Oblivion]

But that is the part of their performance that matters to the game. If the mobs are dropping, the DPS are doing their jobs. If party members are not dropping, then the tank and healer are doing their jobs. Effectiveness is seen in the game itself, not by some number a parser could spit out. Parsers are just a distraction from the more important and useful measures of players' effectiveness.

If the tank fails, then they know right away that he/she needs to change their strategy.
If the healer fails, then they know right away that he/she needs to change their strategy.
If the dps fails, they are usually blamed collectively without really knowing individually if they were doing something wrong.

Granted in most cases you can have one or two dps slacking and still conquer a fight. But this can become a real handicap in the more challenging encounters and so if an inefficiency exists it's better to correct it early on than waiting for a wipe on something harder. If an in-game parser could be designed in a way that didn't encourage competition or harassment I would be all for it. From my experience in other MMOs these tools have been very useful in increasing performance.