DPS display could easily be solved with a system already in game.

[Welsper59]

I don't understand the "DPS optimization doesn't matter outside of raid settings" argument at all. No one says it's okay for a tank to not be able to hold hate or to take the boss for a walk in low-level content. No one says it's okay for a healer to not Protect/Stoneskin or not heal effectively in low-level content.

A DPS' job is to deal damage. If they are not doing damage appropriate to the level of gear they are wearing, they are not doing their job. Period.

Why is this considered acceptable?

It's unfortunately acceptable because it's the least impacting role. Mind you, the majority of content in this game can be beaten by mediocre players regardless of role (or perhaps, some mediocre players for certain endgame content that isn't max tier). At this point in time, would you really take the time of kicking a bad DPS that has little impact on your actual progress of the instance you've ran at least 50 times already? We already let people slide sometimes in content, for example in LotA. I've had healers, tanks, and dps AFK from start to finish at the starting point. The reason? It's impossible to kick them in a rush group that just wants to get things done. Initial timer, mid-combat, and loot still being rolled on prevents kicking.

The only notable time you'd really care about output is actual endgame max tier (see actually difficult) content. Tanking and healing requires a lot more personal responsibility, hence why they stand out the most. DPS are a dime a dozen. In those cases, people already parse, so responsibility is there on the DPS end. It's not a matter of parsers saving people from this, it's the content at hand. If every single thing required a strict DPS check, FFXIV wouldn't be the open arms game it is. That's why it's acceptable.

Oh hell yeah. I've been saying that since page 5 on this thread and I'm a DPS main, haha. Didn't get a response until I started getting more blunt and even then it was the standard "qq toxic community" response. Hell, Massterchef said the exact same thing I did (calling the heal/tank issue a double standard) a few pages back and was met with nonsensical arguments the entire ride through.

The statement I shared in this post actually applies to your inquiry as well. It's the design of the game, which has nothing to do with parsers. Players that are looking to use parsers for this purpose outside of progressive max tier content are essentially going on a witch hunt.