True they do, totally.
But what you don't think being a jerk is.. others might get hurt/disheartened by : "your DPS is too low bye" isn't technically harassment, but you can bet your butt there are going to be a kabillion threads about this kind of kick if there ever is an official parse included.
More people don't want it than do. The majority of the playerbase does NOT want people to have tools to tell them exactly how much they are underperforming. This is silly, yes. People are actually trying to be helpful with this , yes. Most people still don't want to hear it.
You all argue this is going to help and we need this tool. Use one, go for it. But there is a price for it since it's not casual friendly: play PC and DO NOT TELL PEOPLE YOU'RE DOING IT UNLESS THEY ARE OK WITH IT.
I understand how useful it will be for you ultimate/savage types. I GET IT. But most of us really don't care or want to hear about it. Making an official one is just going to make insufferable people even worse. Bad enough we have to deal with "YOU GUYS' DPS SUCKS LOL" , with an official one we're going to get "LOL TANK ONLY 200 DPS BELOW NIN!". I doubt that would be actionable by the GM's (god knows they have more important things to pay attention too) so the argument stands: people will use it for worse things than you think and regardless of "rules" will be jerks about it.
Think of all the things that are "against the rules" that continue every day. RMT, spamming, party votekick abuse. Doesn't stop that from happening.