[Poruku]

I can see situations where a player wants to rp a character with a big focus pool but can't access it as a str/luck/gui maxer without any will/faith/san

To me this is the crux of it. For this reason I would agree it's best to leave it to rp. I generally prefer when mechanics influence rp, but in this case it's something about the characters themselves that I think the players should be writing