This. I'm a strong advocate of a more complex game, but I've seen too much drift on WOW to wish for such a tool to be implemented.
Tools like dps meters are only useful for HL. FFXIV will never implement a difficulty that would justify its use for random content. From then on, there's no point, and it's just an extremely dangerous gamble to think that the FF community will magically be more polite than the WOW community if it's given stepping stones to be toxic.
I also repeat what I said a few pages earlier: if a player doesn't bother to find out how to rotate properly (people aren't stupid: they notice when they're not using mudra in nin; they know when their OGCD hasn't been used for a minute; and they know they're not slamming their group buff. They're just content with this level of play), so they won't bother analyzing the dpsmeter either. And without analysis, the dps meter is useless. Indicating that you're above another player at a given moment means nothing at all.
