It's an optional feature what is wrong with you?
My favorite time in the game when I play the MSQ is doing all the dungeons and trials with the trust system and the characters I'm with in the story, that's the best they have implemented.
You have roullettes and other things to make your trials. Shit open a party finder and ask for help if you need it. Don't use the trust system if you don't want to, you are not bound to use it.

Plesae keep the Trust system, it's the best.