I heard the extremes of this:
From the far right: I talked to a musician from the old school about Steve Morse as the new Deep Purple guitarist...goes like this
Him: Hindi magaling yung bagong guitarista ng Deep Purple
Me: Ows? Eh galing Kansas yan at Dixie Dregs
Him: Ay, walang natutunan sa dalawang banda na yun?
Me: Bakit?
Him: Kasi di niya pinaplaka ang mga adlib ni Ritchie Blackmore
Me: Kahit si Blackmore di niya pinaplaka ang mga solo niya live
Him: Kaya pala puro isa dalawang araw lang ang tinutugtog nila sa mga ibang bansa at di 6 months. Kasi dapat ang ginagawa nila pag tumugtog live, walang pinagkaiba sa plaka.
The other extreme, from a certain blues guitarist I read in guitar player
"I don't need to know lots of scales. In fact I can say a world of feelings with one bent note!"