If I recall, primordial arts are basically the First Arts in existence, due to the said nature. They wield insane power compared to the more versatile and technique side of modern times

Its not all too complicated, just simple actions. Fist Art is just you punching with incredible power and shit. Well you get the point, they are rather based on sheer power than simple honing

And hmm yes the power of friendship, that increases your magic endlessly