I agree with David, that David is on the money.
I have followed, in a very loose fashion, David Vestal over the years when his writings and/or photo testing of paper, technique, or whatever, appeared in some photographic publication.
He is now in his eighties, so he has been around taking pictures for a very long time, and as far as I know, still takes pictures quite often.
I believe that he imparts his knowledge with the hope that others of lesser years may gain from his acquired photographic skills. I could put it another way, possibly he sees his ramblings as a mentoring type of activity.
Whichever way he does it, I don't think you could be too wrong by at least thinking about what he is saying.
Perhaps his online writings aren't subject to the closer editing any physical publication would normally be subjected to, this may explain the grammatical part mentioned earlier.
Recently in Photo Techniques he had a portfolio of work which included some photographs taken around 50 or more years ago and up to quite recent times, they were really very good, and different to most of the stuff one sees on a regular basis.
His photographs in that showing, reflected his writings quite well, I found it most interesting.
Mick.