Parsers are needed. It's just a tool. If you are afraid that someone will use the tool to point out that you are underperforming, the answer to that is: perform better. It's that simple in life, it's that simple in games. I agree that no one is allowed to be abusive and that's what the report functions are for, but that's a poor excuse to keep tools out of the hands of responsible users.

No one is kicking someone out of a party for a 10-30 dps difference. They will kick you for a 100-200 dps difference and honestly, if you are underperforming THAT much you are being Carried.

That's another form of harassment. I don't want to Carry you and you do not have the right to decide not to learn the game and perform so that you can be lazy and force me and others to Carry you. And then argue against parsers so that no one finds out you are being Carried.