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Interesting question to be sure. I’d say that if ALL you do is play songs then yes, you’re likely hampering yourself from learning new techniques (assuming your song list is limited and repeated). I don’t think there’s any one answer to the question though. Everyone is different. I have a friend who practices scales for hours a day. He’s a great soloist but not so good with rhythm. Is he a “skilled” guitar player. For sure. Just different skills than I possess as I seem to have a scale aversion.