In-Game Parser.

[magdahmhara]

The worst thing about an accredited parser is the trickle down effect. It's not just raiders who will use them. They end up being reasons to kick people who are leveling, new people who are learning their class or anyone who doesn't meet the random dps number someone assigns to an instance. I've seen this happen in other mmos, chat spammed after each lowbie fight, not to help anyone but to stroke epeens and shame other players. As much as we'd like to believe that those kinds of players are few, the truth is, annonimity breeds elitist attitudes. I would have no problem if only high end raiders who have their own team would have parsers (which they do already) but it doesn't just stay high end. You can't stop the trickle down effect no matter how much you want to.

[Atomnium]

This very idea has never been argued against by the people against having a parser built in game. At least not that I've seen. They always skip over this.

I May have some explanations of the "why" but what I'm about to say is going to sound very dramatic and elitist in a way... Over the last 10 years of different MMOs, I have personally accepted as a fact that some people just don't want to get better in the games they play or even try to work on self improvement for the good of their teams/friends/communities.
Their selfish attitudes when it come to gaming is so huge that most of them just consider the monthly fee enough to play just like they want to, even if it mean to make 3, 7 or 23 other players (who pays the exact same fees) carrying them in any contents.

It's a sad reality and it mostly apply to PVE contents where a lot of people don't take the competitive spirit seriously.
This is also why we have a DPS/Healing meter at end of a match when it come to PVP, because the competitive spirit is accepted there...

If you guys want to see the competitive spirit evolving in PVE communities and accepted as something normal, we have to find a way to "legalize" it to our whole community.
Just like it is totally normal and accepted to be competitive during PVP it should be acceptable to feel it the same way in PVE contents.
But good luck with that, it may take some years meanwhile we won't see any kind of official parser (SE, feel free to prove me wrong!).