Can someone give me an in-depth explanation why Summoner is arguably the worst DPS?

[SomnusNemoris]

It is not biased at all. The small data sample is no argument. 10-13 people is enough data to provide at least some sense. And as I have said before, Rational Gaze is a top tier hardcore raider who can be used as a legitimate way of comparing BLM DPS with SMN DPS. If this player has 30-80 DPS lower than top tier Black Mages (with 10 higher ilvl!), then if that does not tell you anything, then what does? The data samples are simply halved, which isn't that big of a deal. Do you honestly think there are Summoners out there who have yet to post their 580 T10 DPS parse? Do you honestly think that there are SMN out there who radically improve upon the already collected data? And if so, what argument do you bring against the fact that such a scenario can be equally true for BLM?
Also note that in comparison, to low end of the charts are lower on BLM than it is on SMN, perhaps that also says something about the data.
I have said 40+ DPS, which is a significant number, thank you. How many % extra do you think 8% is from a boss? 3-4! Not a big deal, right?
The SMN does not need a pure 40+ DPS boost by the way. It needs to outshine BLM in the ST departement while mainting the decent AoE and BLM needs to outshine SMN on the AoE deperatment while maintaining decent ST damage, which they already have.