The current iteration is perfect as is.
I am ex WoW player, and new to FFXIV.
No built in DPS meter = No kicking people for not being 'leet'

So that means you have an optional overlay, that uses the game data already found in the damage logs, to calculate something for you. You could calculate it yourself as well, this just makes it easier.
That way you can actually know, how much damage you are doing, and quantify it vs how much damage you are doing after certain gear upgrades.

This way the game prioritizes fun and not maximum numbers, but players who want to actually delve into the number crunching, can do so. And if you don't wanna use any overlay, nobody can make you - in fact if someone harass you, they will get into trouble. So you have no fears about that.