They Should Add An Official Damage Meter With One Condition

[VerdeLuck]

No, damage meter won't solve any PF problems. It's a useful tool for measuring performance in high content. And as said before I do not agree that we will have "an influx of toxic behavior".

Damage Meters aren't needed for any high end content in this game, all of it is able to be completed without ever installing ACT of having anyone in your party with it. The dev team thoroughly tests it every time they release something new.
The amount of toxicity they generate isn't worth it. I reject your opinion entirely that they don't cause toxicity. I've seen enough of my friends playing WoW and the whispers they get when they dare to do less damage than is optimal or forget to update WeakAuras.
That culture of Addons, Meters, and Parsing to that extend should never be allowed to take root in this game, even at the high end content level.

Honestly SSS could be useful, if when you complete it on a job it flags that you completed it. Then party finder could lock duties to only people who have cleared the SSS dummy for the fight. There are some issues with tuning for the SSS dummies, but it would be a huge start to just be able to filter out players who are not capable of doing the damage needed to clear the fight even without mechanics.

If you're this concerned with gatekeeping players then just get a static instead of using PF.