I'm of mixed minds about this whole kinda thing...
First, yeah I can understand the players running Roulettes, Delta/Sigma and junk for stuff like mounts, and they get frustrated if things are taking too long. Hey I get that. But on the other hand...
The Game doesn't come with any kind of way for a player to know their own DPS, and your average player is probably not going to mess around with parsing, especially if they have no intention of ever stepping foot into a Savage Raid, and in fact, some players might be leery of using such programs because of SE's repeated "Don't use 3rd Party Software with the game!" warnings.
I'm not saying someone would get banned over parsing, as people have obviously been using said tools for quite awhile now and they don't get banned, but yet I could understand how a Sprout might be intimidated, and decide to play it safe and not mess with such stuff.
And as others have said, there are so many factors into what makes your DPS. Your weapon, for example. SE consistently makes weapons the hardest things to get because they have such a huge impact on your performance. But yet, if you're some unlucky joe who can never seem to get drops anywhere and you're not really enjoying the wipefests at the Ex Primals (I am hesitant to try one myself because I don't really enjoy that kind of play where you have to play almost perfectly to clear it) and maybe they don't want to wait 7 weeks to get 7 crystalloids, and maybe falling asleep at the NM train at Eureka isn't the most fun thing to do either...... how ELSE are you supposed to get a weapon, then? Kinda wish SE wasn't so stingy with weapons.
So, those joes with the 330 deltascape weapons... yeah I can understand if they are doing crap DPS even if they're wearing full 345 with the rest of their gear.
As someone mentioned above... Casters.
I've not gotten one to 70 yet, but Dear Lord, the AoE dodging is ANNOYING for anything that has to stand and cast. Start casting, circle appears under your feet. Oop, gotta move. Start casting, another circle appears under your feet. How exactly am I supposed to do any DPS, again? One of the reasons I've not been playing BLM, to be honest. I got it to some Lv40 and some of the bosses in the dungeons were just plain annoying because you have to keep dodging and it screws up your casting constantly.
I couldn't imagine trying to do something like Castrum Fluminis as a caster. No thanks. You can count me out on that.
Now, nowhere in this am I saying that one shouldn't try to improve, at least a little, if they are doing subpar DPS for their gear level... but yet at the same time, I don't like to shame people, because honestly we all come to a video game to have fun, and when you sign up for DF, you should always be prepared to get into a random with clueless people or people who do nothing but mash buttons.
Every time I Q up for a dungeon, I am prepared to carry people, and I generally tend to not get annoyed if I have to carry somebody, as long as we're not constantly wiping. A few wipes I can understand, but I would hope to see improvement. If not, well... they'll probably ragequit and we'll get better replacements, lol