A person who has played a lot of guitars will probably have experienced both well set up guitars as well as poorly setup guitars. Such a player will know when a guitar nut needs lowering. Someone on their first guitar will not be able to tell. The capo test can demonstrate to such a player what their guitar could feel like with a correctly set up nut.
If it is easier to play a bar F shape with the capo on the first fret then the nut needs lowering. If there is no difference then the nut is not the problem. More practice is needed.
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