SMN poorly implemented

[Nestama]

I'd be okay if the current SMN became Necromancer with a focus on DoTs, plagues, and changed the pets to become spirits, skeletons, zombies, and other horrors. I'd be perfectly fine with that. Then implement SMN as a new job with an actual focus on real summoning.

That's kinda what Thaumaturge's (NPC's) do. Or Black Mage's (they summoned Diabolos). Either or, that's something the lore has already made impossible for Summoners.
The Allagan Mages did not summon Primals. They summoned the Egi's to combat the Primals of the Beastmen.