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

[Nux]

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Not in FFT at least with all those friendly fire, although i would choose hero job over them anytime.
Give me my Temple Knight now SE !!!

SMN is a DEAD class anyway, OP should change it class
Con :
Abysmal visual effect with exception for Tri-Dis and LB's,
God want to torture you by looking at tiny number on enemy debuff,
Your party already have SCH/WHM/BLM/MNK/NIN/DRG/BRD/WAR/PLD/GSM/BSM/LTW/CRP/ARM/WVR/ALC/BTN/MNR/FSH
Very Anti-fun to play
Artificially difficult to play correctly because god want to punish you anyway
Garlond Ironworks hates SMN and you in particular (bahamut also want you dead)
and wait there's more !! just ask anyone in here ....
Pro:
You can start smoke weed when your MP ran out you cant do s#!t anyway just sit back and relax
Conclusion:
SMN is a class for tryhard and roleplayers

Why did i insulting my own main again ?, maybe it came from the number of people telling me to change my main

[Sanguisio]

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lol I giggled^^

However I've noticed why do people think the game only revolves around FCOB at the moment. There are countless players who cant do FCOB etc for whatever reasons. SMN isnt bad in those duties ^^
Primals SMN good especially when you have multiple targets spaced out, e.g ramuh a SMN shits on a BLM here ^^, Levi like wise, ifrit likewise, lets throw garuda in their as well, because garuda fighting garuda is basically a chicken fight.

Comedy aside, yes for endgame content it isnt the best atm, but otherwise it isnt the crappy class people seem to be making it out to be.