I don't understand the backlash against parsers. Why is this even an argument?

1. SE has stated before they want addons to happen. A pity they aren't going to be in heavensward release, but they're happening.
2. All games have competition. All games have competitive people. All games have some measure of competence.
3. Not having a parser isn't going to make you somehow do better dps.
4. Those that want to be competitive now have an actual benchmark instead of shoddy 3rd person tools which may or may not be entirely accurate.
5. Again, you won't have to trust these third party tools and their validity, accuracy, or any shady things going on. Also no fear of being banned.
6. If you find a meter diva or are kicked because of low dps, then do something about it. Don't play with them again, or learn your class better, or get more gear.

Pretty much the only people that stand to lose are those that have to put up with jerks, and those that are being carried. Everyone can stand to be a better player. If you play more casually, then good for you, you don't have to install it.