Regular nut vs. this one = draw. Yes, strings touches the fretboard in those grooves, but they are not putting any significant pressure on the wood. When I tune, the string glides without leaving string too loose or tight on headstock side. My tuners are not locking ones, but they do the job (at least at home).
I will make a video as soon as I have time. :)
Hmm..you're luthier I guess, so you probably know more. I'm still trying to adjust looking at this abnormality :P Like I said, a demo video would be really helpful.