Having MUC skills are more important than having devastating unarmed skills or amazing gun skills.
HOGWASH!!!!
You're saying that years of unarmed hand to hand combat and/or amazing gun skills are LESS valuable than learning the fence, which takes all of a 1 minute explanation. HOGWASH! Spouting off stuff like that eliminates credibility. I watched this video, and a few others. No offense, but I either disagree with many of the things you discuss, or find them either irrelevant or boring (like the 5 minutes spent explaining that a red Glock is an overpriced, pointless training aid, or the 5 minutes explaining how a person draws from a fanny pack - the size of a football-, which is an incredibly uncommon CCW device). Why buy a $600 "red" Glock when either a $40 plastic replica or just being careful with your regular one will suffice? And who in the world wears a fanny pack for CCW - and if they do, it's pretty easy to figure out how to draw. Unzip/unvelcro, and draw.
There are some outstanding Youtube videos out there. These are not it.
I'll be the first to give a negative comment on the "fence" technique. If you are going to go into the "fence" why not just move into a boxer stance? How does the fence protect you from a slash across your hands with a knife? How does the fence protect you from just being tackled. For most people, a razor blade slash (think exacto knife) across both outstretched hands or being taken to the ground is game over.
And better still, if you think you are going to get attacked to where a "fence" is needed, then create distance. Why are you in a conversation with the person standing right in front of them? I understand that in some circumstances it may be necessary to converse with a person but moving your hands into the "fence" may be perceived (just as much as fists) to be an agressive posture. This may be something for law enforement, but for the rest of us, if it's moving toward punches, I'm stepping back.
So if you're in a condition "alerted to danger" or "expecting a punch" why are you standing there talking to the aggressor.
In a situation where I am engaged in talking to someone where I think it may become violent, and if I'm armed, I:
1) Create some distance, even a few extra feet.
2) Angle body with off hand forward and gun hand rear
3) Front hand up in a "fence" mode
4) Gun hand ready to draw, or maybe even on the butt or drawing.
5) Verbal commands as necessary (Keep your hands where I can see them; back off; I'm feeling threatened by your words/tone, etc.).
Whether armed or not, the key is to disengage.
What I see the fence as doing as giving the opponent the opportunity to just tackle you, which can end very badly.
I'm not interested in going to the ground with someone with whome may have a shank/knife/knuckles/gun, blood borne virus, etc. Those extra few feet will give me the moments that I may need to draw if he lunges at me. Standing there with your hands in front of your face SLOWS your ability to get your sidearm and to the observer it may appear YOU are the aggressor in a boxer stance.