I was in a band with one song written by the singer, who also played bass at home. She taught me the simple bassline by saying 'thickest string that fret' and so on. She didn't even know the names of the strings and freaked out when she saw me play the same notes on the A string - 'You're playing the wrong notes'.
That's interesting because if she was aiming for a specific timbre, or the way moving between notes makes the phrasing she wanted, then she'd be right despite being ignorant of many things. The best measure of this situation is how well she can explain her choices, or how well she can identify why yours won't do something she wants done.
An example is letting rip with the sea shanty 'Spanish Ladies' with a JJ Burnel-like tone, on the far ends of the strings. (Very satisfying, really it is). It's harder than playing it further up, and on fewer and lower strings, but that rant and roar can't be had the easy way.
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