I will use some approximation if I can to avoid spoilers.
I am at a point in the game where I have 2 extra drivers. I've always played with the 3 from the beginning because after a quest from the beginning of the game where you have a 4th driver, he becomes unavailable permanently at some point so I didn't want to "invest" into some temporary driver. But it looks like these extra 2 will be sticking with me even though they have been removed from my party from time to time due to the story.
I currently have three 5 stars blades (plus some extra 5 stars which I use for mercenary quest only) on each of my three main drivers (heal, dps, tank) with some pretty advanced affinity charts. If I were to switch blade / driver I would have to do it all over again.
Is there any benefit to switch to some other driver with new blades other than the obvious one (personal preference, new blade element for combos)?
To be more precise are some blades / drivers more powerful (like by a big margin which would prevent me from doing the late game or something) ? I'm open to some other aspect I might have overlooked.