Honestly I think we're at the stage where they couldn't add a dps meter even if they wanted to because they've fostered such a strong anti-performance mentality, half their players would probably cause an uproar over it and act like the sky is falling down.

Yoshida simply intended to create an environment where players helped each other and were inclusive, but this has been abused by the "you don't pay my sub, I'll do what I want, anyone who disagrees with me is toxic!" type of player who sees the ToS as some sort of validation that they're in the right, it's a good thing to do the bare minimum because it's FUN and veteran players are inherently evil and need to be kept in check.
Every time this topic is brought up, everyone forgets harassment and toxic behavior are already against the rules. How can a parser create harassment when harassment over dps nets an instant ban? Why wouldn't the GM's handle it?

The game is already very toxic anyway. Instead of a straight up "you suck" that you can simply report and have the offender banned, FF14 leans into a passive aggressive "but you're lv90, you should know better", "ok, guess I'm solo healing lol", "ok, no one else has had a problem with me playing Ice mage, but guess you want to be elitist", "lol guess you bought that legend title" and so on, that's seen as perfectly fine.