Hand position varies according to what you are playing. Behind the neck is the "default" position for most things. It places your hand in the most advantageous position to move around the fretboard fluidly. However, if you are doing a lot of string bending, having the thumb planted behind the neck isn't gonna work out really well. Sometimes you'll want to fret a string with your thumb (that is even true in some classical pieces) and then return to the "default" position.
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