An anectdote but it rather underscores the devs' decision. I also play WoW and have since Burning Crusade. I was doing the expansion's raid in LFR (which of course is simpler than Normal) and got called out for not doing enough DPS, when in fact on my dps meter, I was 3rd... and I play a beastmaster hunter, which has some dps issues to begin with.. yet I was third in dsp? And having someone lower than me calling me out for not doing enough? Not the first time it had happened, won't be the last.

Parsers can be nice tools, I can't deny that they can inspire someone to learn their rotations better, but unfortunately, that is outweighed by the people who will use them as shaming hammers.