Since I watched the whole video, I guess I should comment...
I find basic testing like this to be a good thing, but not at all a replacement of the Zone System. Furthermore, there are some basic problems in the testing that make it not directly applicable to exposing and developing film and making enlargements. I'll start with this latter.
The problem with contact printing step wedges is that it completely ignores the flare that is always present in-camera and when enlarging. In-camera flare affects the shadow detail and effective film speed and changes the distribution curve around in the low-density values (shadows here). Flare during enlarging does the same for the print, except that the low-density values are the highlights. Just about everyone knows that a contact print and an enlargement of the same negative will exhibit different contrast. A better way of representing this would be to enlarge the step wedge; that would at least take flare at the enlargement stage into account (although still ignoring camera flare). Certainly, this method will get you a nice starting point for getting into the field, exactly the same as basic film speed and development testing for the Zone System does. Still, I, like David, prefer real-world tests and refinements.
Now to why this isn't a replacement for the Zone System. The Zone System presupposes all of what is contained in the video: i.e., establishing film speed and development schemes. If one somehow takes into account the flare problems, the method in the video is likely as good as any other for doing this. The Zone System, however, is not really an exposure-and-development system, it is a visualization system. Coupled with spot metering and careful evaluation of the luminances in a scene, a Zone System practitioner can visualize the various possibilities the scene presents for rendering in a print and choose the one that represents his/her desired portrayal and artistic vision. This can be a significant departure from reality and what is commonly accepted to be "normal" rendering of a scene. Or, one can decide that no viable rendering is possible and decide not to make an exposure. The problem with simple exposure/development systems, including this one, is that this aspect of the Zone System, its "heart," if you will, is simply ignored.
I used to make and carry around Zone Rulers for each film and development scheme I commonly used. Now they are in my head. I know when I meter (to a pretty great extent) what a "normal" print will look like and what the prints will look like with different development schemes so I can choose one that suits me. I can also use that knowledge to add filtration, plan dodging, burning and bleaching, intentionally underdevelop so I can print on a higher paper grade, decide if I want to use SLIMT techniques on the negative or pre-flashing when printing, etc., etc., which will also determine development scheme. All this before I release the shutter.
Sure, there are times when I just meter high and low, indicate a development that will retain all that and say, "all the information will be on the negative; I'll deal with it in the darkroom." However, this isn't visualizing, or really using the Zone System's main advantage. It's the times when I say, "I'm giving N+2 even though that'll blow out the sky and I'll have to flash the paper and burn with a low-contrast setting to get any detail there, but I really want separation in the mid-tones, so I'll deal with it when enlarging" or, "I'm giving this low-contrast scene more exposure and developing N-1 so I can print it at grade 4 and really separate those shadows (which are now up on the straight-line portion of the film's curve)," etc., when I'm really using the Zone System. In other words, it's when I'm using the information that I got from metering the scene, coupled with my knowledge of possibilities, to make a negative that many would not consider "correctly" exposed in order to better realize a visualized rendering, that I'm really visualizing and using the Zone System fully.
The Zone System is alive and well for me!
Best,
Doremus