[quote=byrdmanx]
Stats does play a relatively role with using certain special skills and NP abilites... medusa mystic eyes you have to pass a stat check to be affected by it... God hand also uses the parameters when determining its effectiveness
[/quote]There is some importance to them, yes.
Although your example is only correct with Medusa's eyes of petrification (and even then technically that decription is BS given what happened to others).
God Hand needs A or maybe even B+ rank Noble Phantasms to pierce it, nothing else can get through.

Also a "balance system" which is completely ignorant to the setting is only hurting the game.
Like I said, 15 points is too much for Assassin class, maybe about right for certain less powered Servants and utterly inadequate for anything at the level of "average Servant" or above.
It doesn't work.
Just use your damn common sense and you're done.
If somebody tries to abuse the system then just have the damned brain to notice it.
Thing's simple as fuck.