That's one of the videos that started me down this path actually.
And while I agree with you that for the vast majority of situations a quick draw probably isn't going to be a factor, aren't we always stressing the idea that we must be prepared for the worst possible situation? And couldn't one of those really bad situations necessarily involve the need to get your gun into the fight as rapidly as possible? I mean, yes the odds are extremely low that I might even get into a gunfight, ever. And that means that the odds of needing a quick draw-stroke are even that much lower. But it could happen, right?
And the reality is that my draw-stroke is pretty slow or average at best. I'm never going to be accused of being a fast draw guy. So it just seems to me (and I freely admit I might be wrong here) that to reduce the time it takes to get my gun working, knowing I'm not Quick-Draw Mcgraw, it might be in my best interest to look at a faster system.
Which is part of how I came to this point.
The other major reason I like the idea of appendix carry is the security. No one is going to reach into the front of my pants and grab my gun without me knowing about it, and if it did happen, I'd be able to use both arms to fend the attacker off. With hip carry the gun is just more exposed.
Here's another video from Rob Pincus that addresses appendix carry issues that I found interesting:
https://www.youtube.com/watch?v=xCry48DLICo
I guess it is possible you could find yourself in a situation where you need that extra .25 of a second but when I think about the odds of that being the difference in winning or losing it is way down the list for me.
When I weight that against a possible ND in the appendix position I think the odds are higher here than me needing that .25 of a second. I fully understand that others feel differently.
Security of the gun is often sighted as a reason to carry appendix but I also think that situational awareness also goes a long way to keeping your gun secure.
If you think it can work for you then give it a try. Get a good rig and give it a try. If you hate it all you will be out is a holster which you can most likely covert to hip carry or sell.