I was planning on bringing up an example that this isn't always true but someone ended up posting the scenario for me. Chances are that many of the people (not all) you are describing that need to see their dps with their own eyes will only strive for "good enough" numbers. If they aren't currently trying to be the best they can, then they most likely won't even if they see what their numbers are. While I'm not saying people need to be "zomg! mad deeps" and topping charts, everyone should always strive to maximize their potential for their current situation. An example of someone who hit good enough and stopped caring is below:
So while this person will eventually care, the fact remains that currently, good enough is good enough. As such, I still believe that the presence of a parser will not cause someone to improve, it will only force them to achieve good enough values. Only the actual desire to improve will cause someone to improve. I will cede the point that for those who truly want to improve, a parser will help them, but I don't think it's worth the amount of toxicity that will arise due to having an in game parser that shows everyone's numbers.But my point remains: my damage is high enough (since I could see it), I don't die (so I'm not an hindrance), and for what I know (as in, dungeons and alex normal), I'm doing ok overall, which is more than I could ask.
And all thanks to the parser because I managed to see my numbers and say "yeah, I'm doing well!". Infact if it wasn't for it, I wouldn't even bother with dpsing.
But there's always room for improvement....when I'll care, that is.
Many of the lore items aren't that good at i220 so you don't really need to spend lore to obtain optimal stats for your current ilvl. Even unmelded i220 crafted gear is better than the i220 lore and Midan gear (example is the i220 chest, with 0 melds, it is BiS until the i240 Midan chest from M4S. In fact, there are some i210 items that are better than the i220 gear without a melded materia or their equivalent after melding. I never said you claimed to be the best, the only thing I pointed out was that you claimed to know the job and part of knowing the job is understanding what stats to focus on for that job. Just tossing on whatever gear you have available because it has a higher ilvl than your previous item isn't understanding the job and is in fact just focusing on ilvl.