The Gambit system was limited, what we really need is the:

Paradigm Shift system from Final Fantasy XIII

It's a fully optimized battle system that allows you to focus on your actions while the other party members will fight on their own in the best possible way, even better than some human players!...

I wish we can train them in such ways as to be able to enter Extreme trials and have perfect runs, of course, to prevent abusing of the system if the human player dies it will be an instant wipe!...

Using retainers as platoons would be an expected feature to me and even better would be if we could summon alternate characters and use them as well if they met the necessary requirements!...

I'm looking forward to the Troopers system!...