I can agree, but when in doubt follow principle of Occam's Razor.
Personally, I prefer
Bic disposables. Reasonably cheap and they last me for a couple of weeks before they get dull. Unless my wife finds them and uses them on her legs!
Now regarding that goat business. I'm biased since a number of years back I posted similar pictures on a thread here. I even found a picture of somebody shearing and Angora Goat to satisfy any nitpickers who might point out that sheep and goats are different species. I have other reasons for supporting this
functional explanation for the term
yee gee kim yeung ma.
First, way back in the 80's my old Chinese sifu also explained it this way, teaching us to us it to mount, control, and pound a fallen opponent when sparring. When doing this, onlookers in the class would all cheer, "ride that goat!".
....BTW sifu was college educated in Hong Kong, and was a real stickler on getting the Cantonese terms right. He often pointed out how poorly educated Cantonese speaking practitioners often made errors by misunderstanding similarly pronounced words. And
he interpreted this as "goat riding stance" (yeung ma),
not as some interpretation of "yang"! Incidentally, he was Sergio's first teacher too. Really, I think Sergio is just looking for some more mystical interpretation to build his rep. Certainly it's nothing a pragmatist like GM Yip Man would have taught.
Secondly, it works even better IMO when applied standing to one side and turning, dropping your knee onto your fallen opponent's chest or neck as a
gwai ma (kneeling stance). It works well when controlling your opponent's arm in an arm-bar while you press your hips forward, then droping your weight via your knee onto your opponent. Or you can pin him, pressing his arm across his face and delivering punches or elbows with the other arm. Either way, this stance can really cause pain, gives you great control, and allows you to disengage more easily than by straddling your opponent.
Finally, I'm a city boy and never sheared a sheep. But as a kid (pardon the pun), I'd help my grandfather during Spring roundup on his ranch. When roping and throwing the calves for branding we had to pin them with our knees from the side. Unlike my country-boy cousins, I sucked at riding and roping, but I did pretty well throwing and hog tying the calves, and pinning them with my knees. I looked at it as "wrestling practice", In retrospect, I think it was my first WC training!