If we're to have multiple minions (With the exception of totems) They'd have to be so extremely weak that enemies only have to look at them for them to fall over, and having AoE skills oneshot them aswell. Or, they'd be able to tank somewhere along 2 hits and deal near to no damage with how NPC's will interact with them, "wasting" their limited AP pools on several targets.
A summon bloat would mean they would have to be weak, or they would trivialize the game.
Many summons would make playing with a summoner feel really boring the same way playing with a poly rogue would, their turns would take years.
I'm fine with how it works currently, 1 main summon and skills that enhance it, as well as totems that are actually very effective but very squishy.
There is no totem cap. Cooldown is the only limit to multiple totems, this can be seen in certain areas in the game where you can be out of range from a fight and put out totems that immediately enter combat, while you would not. This however, Isn't intentional. You could use the Aero skill that gives you an additional turn and/or skin graft to get more totems, though that wouldn't be ideal.
The weakness in summoners right now is mostly by tuning.
