Would you like an in-game parser?

[Reynhart]

You Said people would kick them for doing 100 dps less than optimized.

Yes, I said some people will complain about a DPS doing 100 less than expected. And you know why ? Because both leaders of my two last statics did.

I'm not grasping at hypothetical straws here...I don't want a parser forced on me, because this is exactly what made me quit raiding after I loved doing Coil. Make them official, and those people will have even less reason to shut their mouth.
There are other ways to improve, this is the best way to point fingers at someone.

I'd be perfectly happy to let anyone in the game monitor my numbers in any piece of content, on any job if it meant they were more likely to accept criticism and play correctly.

They won't. Those who accept criticism already will still be the same. Those offended by advice will probably be even more pissed if you give them irrefutable proof.