For those arguing against parsers because it may lead to toxicity within the community, I have to disagree. By not advocating an in-game parser you are only hindering yourself.

You won't know if your DPS is bad but I can guarantee that 95% of endgame fights are parsed by someone within the group. If they aren't initially then as soon as the group wipes to DPS checks, someone will fire their parser up. At that point, you're still blind to the fact but if you're the one who isn't holding up, you'll be removed anyway. At least with an in-game parser you would be aware that you're low on DPS and need to step it up.

You shouldn't just expect or assume that you're getting parsed. If you are doing any endgame, you should know that you're getting parsed.