Have you ever tried beating this game with all the main characters practicing everything?
How did you enjoy it?
I have considered trying this on my next playthrough, but I am a bit concerned about the conflicting stat development and that I might find myself in a predicament where some important stats suck and it becomes hard to do anything about it.
Anyway, I have a feeling that a party like this might be pretty fun.

Of course, it may be a good idea to have the characters take turns practicing individual weapons, just so that they are more flexible and can use as many types of weapons as possible that are found in dungeons.