With all those inventory additions I'm surprised you even need that many retainers. I ditched my extra retainer because of that.
We are getting 999 stacks and extra inventory on chocobos plus the new glamour system which can free up additional slots from your retainers.
I have absolutely no issue and I'm happy with that. I think inventory is now balanced.
What I'm not happy is the main scenario roulette changes and the tank changes. But that's for another thread.