Would you like an in-game parser?

[Reynhart]

If devs know that the parsers would lead to an increased understanding of your job, and we all know that players who learn to play better enjoy the class more, which helps keep player retention, why wouldn't they add such?

Because a parser will be far more used for harassment than improvement.

Look at the examples that were shown here : "DPS doing 500 instead of 1500", "a BLM casting only Ice magic"...you don't need a parser to see the flaws in those people. Like you don't need a parser to see a tank not using cooldown and taking way too much damage. What a parser will do is helping you to go from really good to best...to gain those last 10% DPS you might lack in your rotation. And even for those 10%, we actually have a way to judge our rotation, with Stone, Sky and Sea.