(1) Who among you utilize the hyperfocus technique, either scientifically or as a guesstimate?

I have never used it, even with my Rollei 35 film camera which had NO focussing system. You had to guess what was the distance and set it on the lens, which was fairly short focal length (40mm). I used this camera most of the time walking about in fairly poor light and setting a small aperture and focussing at some distance didn't suit the subject. I used to focus on 5 feet at f8 and that gave me the right depth of field

(2) Do you use a DOF chart - perhaps one on your lens or otherwise?

I used to use one on my film Hasslblad 6x6 when doing landscapes on a tripod. It's easy - the depth-of-field for the aperture is indicated by two indicators on the lens. That move when you change the aperture. When you're doing a landscape on a tripod with a big camera and a hand-held spotmeter you have time to look at things like that.

Nowadays if I'm concerned about depth-of-field (usually on a tripod again) I just set the autofocus on the most important spot and use Aperture priority to ensure I'm using an aperture with the right depth of field.