Biggest problem with SMN before EW removed its frontal lobe was that the pets were independently casting spells - this didn't really matter with any of the standard egis, you'd just sic those anyway, but if you had to move in a demi phase they'd follow you and then bahamut just doesn't use wyrmwave at all because fuck you, that's why. SCH fairies did this too, for that matter. Lovely feeling to miss a heal because the fairy decided it just didn't want to cast that, actually.
I am TBH curious to see the reports on how BST works because if it has independent pets and they work anything like old SMN then they've either fixed this (and remember, for SMN the fix here was to rip the whole pet system out basically, so my hopes aren't high for them having figured out how to do that in the intervening years) or it's going to be complete ass to handle them.