I'm not a professional Luthier, but rather an avid guitar player with numerous instruments to maintain and I am endeavoring to become better informed about aspects of maintenance and minor repair. Today my question involves fret leveling tools and techniques.
My goal is to make my guitars more playable with lower action being taken as a considerable target goal. I have small hands and need help at times in this department.
I have watched many hours of film and done a fair amount of reading on the subject of fret leveling. After investing in some professional fret leveling tools, namely notched straight edges and leveling 'bars', etc., I was having a discussion with someone about the difference between radius blocks and the leveling straight block as they relate to the radius of the neck. My own common sense tells me that to properly level the frets to an exacting standard on a neck that has a radius, even a slight one, that the leveling tool would need to have a matching radius. But many of the videos I have watched seem to suggest that radius blocks are used to create the radius on a fretboard itself (no frets) and that a leveling bar can be used for the fret leveling.
So can someone please explain to me the pros/cons of using a radial sanding block as opposed to a straight level edge when leveling frets? Are people using leveling bars as a matter of convenience? For the most exacting leveling job the frets need to be levels with the exact same radius as the neck? Or is intonation only affected by fret to fret height? And not the height of the fingerboard between frets on either side of the neck as opposed to the centerpoint? (The latter statement seems absurd to me). But then what do I know? I'm an amateur

Thanks again in advance for any input.