Spirit perp cost is useless. Stat atmas are not. The effect may be low, but it's not zero and anything greater than zero = more useful than spirit perp cost.Keep telling yourself that. There are studies and tests done on the subject that shows that they are useless.
You've also obviously never don predator claws with dd atma sets- the damage increases dramatically, not slightly. Those increase your attack a lot more than avatar physical attack merits do, yes. but everything helps, whether your unscientific test says so or not. Players barely notice a difference between 5 and 10 attack, avatars are no different. I have merits in accuracy, magic accuracy, and magic attack. Even if you think the accuracy is never needed from skill +, its better to have that insurance than to waste merits on something that has no meaningful use whatsoever.
They haven't done anything that badly wrong with summoner over its history. They've added many useful functions and unique abilities for the job. The job's only serious flaw has been and continues to be being locked down by recast timers that hinder it more than any other job is hindered by them.I'm just glad they said "Screw this, we aren't adding SMN to FF14", so that they indirectly could admit that they haven't done a single thing correct with SMN since 2001. 10 years and still no clue how you'd make a mage function with a staff, spirits and avatars.