I find the "basic method" as he calls it, works just fine. To each his own.
Whilst nut work requires practise to get consistent results and learn what not to do, it isn't rocket science.
If I'm cutting a nut from scratch or starting with a pre-slotted blank, I do use feeler gauges for roughing in. Again, this is what works for me.

My gap targets (with capo on 3rd fret) are .008" E6 & A; .006" D & G; .004" B & E1. I know that doesn't create a perfect radius, but I've never had a complaint from a customer or problem on my own guitars using those measurements.

FWIW, when I first started doing nut slots I did step them evenly (.008"/.007"/.006" etc.) but I didn't notice a difference between that and my current method.