I am thinkin that a zero fret is for intonation purposes .... after that it iust math lol...so it would not make a difference with the rest ... at least that is my take ... and I agree totally with the material analysis ... curious though I am not very familiar with them
Since most of my friends and buyers are inveterated alternate-tuning players, I have made 0-fret on my guitars for the last 2-3 years now! Today I must say, I have no good argument why I should choose normal nut!
As an example: My Baritone guitars! Sometimes they play C-C tuning with 015-065 strings, Then A-A with 017-070 ! It is not possible to adjust a normal nut to both sets!
And the 12 string guitar! 0-fret is just Perfect!!
i have kiso-susuki with zero fret and 2 screws on the bridge(i do not know what for) it plays wonderfully mellow and never loses tune.
it is a gibson dove copy from the 70,s. i am only a very satisfied home hobby only player.