I'm not against the idea, especially if it could be something that we'd be able to intentionally opt in for during raid finder practice/learning parties. But a concern I'd have even with even just personal parsers is that it might lead to an increase of people playing recklessly in order to increase their numbers. Better parses don't always necessarily equate better play. Like Summoners who spam Ruin III outside of dreadwyrm trance when there's no real need for any other kind of dps surge in the current fight (like the party struggling to meet a DPS check). Playing like that is a good way to be useless if something urgent does pop up and can also take the aggro from the tank. But people already do that to get placed higher on the aggro table so it's probably a moot point.