Why are low standards for dps acceptable?

[autumn]

This is how I play it. Either I go in and give it 100% or I don't go in.

Whilst I agree with the sentiment of this (personally I always try my hardest), what happens if you think you're giving 100%, like genuinely you believe you're doing your absolute best at your job, but you've misunderstood or have been told something wrong so others see you at far less and assume you're being lazy?

This comes down to attitude of course though, in an ideal world a simple exchange of words can go a long way if it's kept civil. If someone more knowledgeable then says "hey, I noticed this and I know a few tricks that could improve your dps, have you tried X, Y, Z?" it'd be nice if the person in question then replies and a conversation ensues and knowledge is imparted. But what we have been shown in the image is "hello?" "is anyone there?" "is this a bot?" which isn't exactly a nice way to engage someone in a lesson. After that they (both the tank and black mage) are incredibly defensive, excessively so but I can see why. And I'm betting many people have witnessed this kind of exchange or been part of it before. Runs already aren't the most sociable with often a "hi" at the start and if you're lucky a "gg" or "thanks everyone" at the end. Again we don't know exactly what else was said prior to this though.

And you're spot on about dps not having a very visible way to meter their skill in game compared with a tank or healer other than if the run seems to be going faster than usual. It is annoying playing dps and having no real way to tell if you're up there with the best or floating around average, I know I could get a lot more out of my job dps wise to be at the point some of the best in my fc are at.