It works well in Aion to keep skill bloat down, no reason it couldn't work here too.
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Idk if this was suggested or not yet. But making the MCH turrets follow, similar to sum/sch. That would help maintain the turret buffs so they are more equal to brd.
For SMN and SCH, just remove the need for all the different buttons to have your pet manually attack/cast and consolidate them into four abilities whose effect is determined by the current Carbuncle/Egi/Fairy. These names are clunky, but you get the gist, I hope:
Alpha Tactic: standard auto-attack/heal
Beta Tactic: the stun/knockback/regen/debuff heal
Gamma Tactic: the AoE attack/regen/buff
Delta Tactic: the AoE buff/Contagion/Silence/whatever Eos' 4th ability is (not a big SCH player since 3.0).
That just condensed the 12 SMN pet and 8 SCH pet abilities to a max of 4 shared among the Egis and Fairies, assuming you also have their auto-attack hotbared (which I don't know why you would, but I'm not a big SMN/SCH player, so feel free to correct me on that).
True, but on controller it's been a nightmare to get everything for SCH and SMN to fit on three cross hotbars (two standard and an expanded hotbar). Admittedly, limiting myself to three per job is a personal preference, but those two jobs do have the largest amount of ability bloat if one wants to manually control their pets.