Opinions on nut slot height needed

you accurately measure and adjust nut height to the perfect level for the softest feel possible

Nut slot height should be a barely perceptible distance from the first fret when you press on the second fret This is an excellent article

nuts and bolts slot The general idea of the Nut Slot Height feature is to be able to project a perfectly straight line from the nut, directly to the top of the second fret -

nut slot depth The height of the strings from the neck of the guitar should be as low as possible without having any buzzing The depth of the nut slots on the open string