Ok so, first of all let's take a look at this: Character's Stats - Basis
STR affects P. Attack (general damage output) and, of course, P. Critical damage (damage on critical hit). Any physical skill rely on STR stat for the dmg output, the logic goes.
So, buffs enhancing P. Atk. and P. Critical Damage (directly like Death Whisper/Dance of Fire or indirectly, like Might) increase the physical damage output, whether it is dealt by standard attack or skill.
-
Talking about Critical rate (chance to land a critical hit) it is affected by DEX.
But buffs (like Focus/Hunter) enhancing the Critical Rate should also increase the chance to land a critical hit from skills (not every physical skill can land a critical, watch out).
This should be pretty simple but I find a lot of confusion.. Buffs like Might/Dance of Warrior affect skills. So why Focus/Hunter Song should not?