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

[Romsca]

Let me clarify that a little more Vi. Hawk's eye increases your dexterity stat by 20%. Spur and rouse increase the actual attacks damage by 40% each. Not even trick attack comes close to the sum damage done by enkindle with spur and rouse.

[Viridiana]

Let me clarify that a little more Vi. Hawk's eye increases your dexterity stat by 20%. Spur and rouse increase the actual attacks damage by 40% each. Not even trick attack comes close to the sum damage done by enkindle with spur and rouse.

If you're doing AOE, sure. Ifrit is 300 potency per target per 120 seconds (if we go with a 2 min CD for this example). Barrage is 606 or 808 (depending on timing, assuming AIW Bow) potency per 90 seconds.

Ifrit: 300/120=2.5 potency per target per second.
Barrage: 606/90=6.73 potency per second, or 808/90=8.97 potency per second. If we adjust for odds of hitting either outcome (about 72% for 606 and 28% for 808), we get about 7.36 potency per second.

So, speaking strictly by unbuffed potency, even with 120 sec CD Ifrit has to average almost 3 targets to catch up to Barrage. With the actual 300 sec CD, it's more like 7 targets. Now, even if you buff Ifrit by 80%, that's 4.5 potency per target per second. That would solidly beat Barrage's potency at 2 targets, unless you can consistently hit 8 Barrage-shots every CD (which would screw with the Barrage CD by about 2 seconds maximum and not really throw the potency per second off by much.

But, then again, I don't know how pet potency compares to BRD potency. So, yeah. . .