Is the strumhollow redundant?
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I'd like to respectfully disagree with Dusty on one minor (yet still important, in my opinion) point. While I certainly agree that one should not be "going so deep into the strings that you hit the fretboard" I do not agree that you should be "gliding along the top." That depends on the tone you desire. For the fullest tone, the dominant direction of the pick (or finger) should actually be *into* the fretboard (without going so deep as to hit the fretboard), rather than across the strings parallel to the plane of the top of the fretboard. This is easier for many people to do with their fingers than with picks, and when playing individual notes or chord-melody style vs when strumming, but angling the pick as Dusty suggests actually helps facilitate this "down toward the fretboard" angle.
As always, these are *choices* available to the deliberate player. Try adjusting the angle of your pick, sure, but also try adjusting the direction of your picking (towards the fretboard vs. parallel to the fretboard plane) and see what gives you the sound you want for the piece you're playing. There's no "one size fits all."
Just my two cents. :)