pure preference. Mine were usually set around .010” relief measured around the 9th fret using the string as a straight edge. String height around 2mm at 17th fret. This all depends on your tuning, string gauge, and pick attack.
Most manufacturers do it that way but not everyone does.
According to the Music Man FAQ...
"Factory string setting for standard tuning starts at the bass side 2/32" (1.59 mm) to 5/64" (1.98 mm) and the treble side is 3/64" (1.19 mm) to 2/32" (1.59 mm) measured from the 12th fret to the bottom of the strings."