I love parsers and personally use them in order to figure out what my optimal rotations are and be the best damage dealer I can be, but after that I turn it off. Some people obsess over these things far too much and it does give them tunnel vision to a point where it makes them forget more important things like mechanics and that this is a video game and to have fun once in a while.

I would strongly be in favor of the game adding a parser for just your character so that you can see what you're doing and how to make it better, but it is not necessary at all to scrutinize what other players are doing. You can tell fairly easily without the use of a parser if someone isn't doing what they need to be doing. The numbers alone don't give you the whole story and so when someone looks a bit lower than they're supposed to because they were actually doing the mechanics it ends up making people stupid as the op said.