Not all of them would be useful all of the time and you can swap out skills in dungeons if you're not in battle. Like I can see the rescue thing as being completely useless if you're doing main scenario but useful if you're on a mentor roulette with a sprout who's still learning how Titan works or which bosses have unmarked frontal cleaves. Overall the system will probably still be kind of rough when the game actually drops and we're going to have to be vocal about any issues that come up so the devs know what adjustments need to be made.