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

[Judge_Xero]

Summoner's are spike damage there DPS starts high then after 4min their DPS rapidly declines because they instantly lose 27% of their dps for 60s since they have no Aetherflow stacks, Shadow Flare is a waste of mp to cast and enkindle is on an ungodly long 300s cool down for a move that contributes to 2% of our total DPS. Even with all of our DoTs ticking which is 35% of our Dps with the pet doing around 28% and ruin spam 10% anyone can plainly see during the phase in which Summoner's are out of Aetherflow stacks we lose 27 - 30% of our DPS for a minute which is 8100 damage if they do around 450 DPS and 40,500 damage over the course of a 10 min fight. That is if a Summoner plays perfectly if the Summoner is good or average they can easily lose 60,000 damage over a 10 min fight which lose of 100 DPS that is the issue with Summoner players are punished for playing perfectly and brutally punished for being good or average.

Please tell me how you make your 3 Festers do 8100 Damage. The best I could do with lucky crits is probably closer to 4500 Damage (75 DPS), but on average it's more like 3200 Damage (53 DPS)

nvm

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To OP, I agree with others that it sounds like you don't want to play SMN.

As to why SMN is the worst DPS, is because it's a DoT class. It is punished for things dying quick, because you don't get the full potency of a spell if your dots don't run their full duration. Not only are the dots expensive, but they are also incredibly weak if they don't run their full duration.
Because of this you have to constantly plan ahead limit your resources to keep MP and maintain as much damage as you can.

I.E. Main boss has all 3 dots, Shadow Flare and you just refreshed Contagion. 1 single mobs spawns with ~20,000 HP. (it has to be tanked on the opposite side of the arena, because if it gets too close to the boss the arena explodes) Between you and your other DPS party members you have 1800 DPS, so this mob is going to die in ~11 seconds.
Do you
A: put all three dots on this mob, Fester and Swift Cast Shadow Flare
B: toss on Bio and just Ruin Spam
C: Energy Drain X 3
D: Ignore the add and just continue to attack the main boss.

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Then you can ask yourself...how could I know how much HP this mobs has? and how the hell do I know on the fly what the Raid DPS is between the members attacking this mob.

Rhetorical Question of course, since you can't really know, you can only guess. But unfortunately for SMN, it could be the difference of:
(in addition to what your dots are doing to the main boss)

A: 1500 Damage for 650 MP
B: 1550 Damage for 422 MP (plus an unused Aetherflow Stack - 1000 Damage to use on the main boss wahoo!!)
C: 1575 Damage for 0 MP and 1575 lost Damage because you just wasted your Aetherflow ><
D: A loss of 560-700 Damage (depending on the server tick) because you could at least have tossed a Bio on the add, and then Ruin'd the main boss.

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On the opposite end of the spectrum though, SE can't make Summoner's potency too high, because their are people who can think on the fly like that, and create a bit of a Monster in the DPS world. You do need a risk/reward balance as well seeing as SMN has some of the highest risk in casting any of it's spells.
SMN seems to be the worst DPS because it's reward is less than it's risk. Not saying that the class isn't amazingly fun or that is has much less damage than other classes, but for the average player you're better off playing a class where the reward at least equals the risk, that way if you can't push it to it's potential, you can at least win all the things.