Somewhere during my evolution as a fly fisherman when I wasn't paying attention, fly choices became a whole bunch of "named" fly patterns flies with MORE choices than you see in spoons, spinners, plugs, and soft plastics combined.
I was glazing over in the video after he mentioned Parachute Adams...
"Corn Fed Caddis, PMX Cricket, Egan's Poacher, Duracell, Guide's Choice Hare's Ear, Higa's SOS"...
HUH, WHAT??? Never heard of any of them...
I guess I get it IF a "PMX Cricket" or a "Corn Fed Caddis" becomes your go-to cricket and caddis pattern and you stop there, but the problem is fly shops and "experts" on the Internet are always coming up with new slick named variants that are a must have and all of a sudden...
Folks are back to being confused and feel they need 10 different patterns for every bug & life-stage.
Do whatever floats your boat, but I employ two approaches that have served me WELL and I catch PLENTY of fish using them:
1: Generic fly patterns that only vary in color & size - For example, all of my mayfly duns are the same generic pattern tied as a thorax or parachute and the same goes for mayfly nymphs. I also only fish an EWC as a dry caddis.
One of the many things I like about this approach is if I am fishing and out of the properly colored fly in a size 16, I just use an improperly colored fly in size 16. I can't tell you how many times it didn't matter one bit. Also, if some new gobbledygook named fly is suddenly mentioned on every website, I may look, but I will almost never "bite."
2: The "chow line" approach (This goes hand-in-hand with #1) - If the fish are hungry, they get what I am serving. I don't feel compelled to have a whole bunch of options like a restaurant with 4 pages of regular, gluten free, organic and vegan choices...
I run a chow line, just like my grandmother; eat what I am offering or stay hungry....
If fish are on BWO's, they get MY BWO pattern in the appropriate size. If they don't take it, maybe a size difference or a switch from a thorax to a parachute is tried. However, I never felt or had a need to carry or use a bunch of different patterns representing the same bug to catch fish. That's one rabbit hole I fortunately learned was unnecessary to continue exploring.
Maybe more of the newer generation of fly anglers are GF or didn't have grandmothers like we did so that's why they feel compelled to give the fish a lot of choices... 😉
YMMV