If I recall correctly there is, was, or at least meant to be one like system already- back when Yoshida was talking about chocobo ai.. like 8+ years ago and they mentioned the gambit system (like by word exactly), this was around ARR. Maybe also mentioned again on some machine related content that never ended up coming up- think if I remember a French article correctly.. Also like 6+ years ago, around HW time lol.

Perhaps trusts use this type of thing already, it's just not API revealed to the player in essence. What I mean to say is I wouldn't be shocked if something akin to what you said isn't already in some shape already available as a tool to the devs, given it has been referenced by the devs themselves a few times. At least skeletons of that idea.

Personally I would love to see changes to the trust so they have development opportunities, I like their concept, and using them for first go arounds, but after that I usually just look at them and look more wistfully at my squadrons. So improvements to trusts would be neat, particularly if like squadrons there was investment. I have no stats, but my 'vibe', lol, was that squadrons did not have significant impact to the DF. I believe that you had to invest in them helped (and perhaps also because their AI is worse than a dodo on fire, but... IF you invest in squadrons, the results are absolutely impressive).

Would suggest ensuring the progression system is not levels though, at least in the most generic term (I'm glad they removed the level gating concept). Could still have companion levels, or quest chains, etc. Perhaps you level up an Azim soul stone, or something lol- power of love friendship, the job! Captain planet.. he's our hero..

Something like this:
Quote Originally Posted by NekoMataMata View Post
They should add the mastery system to the scion(and friends) trusts in ShB and EW. It'd make leveling up the trusts over just using them via Duty Support actually rewarding.
Definitely would like systems of progression, just don't level gate the trusts :P.