Glad you feel like advice from people who actually do what you asked for should be ignored and that reading an article by Chris M makes you an expert. Probably shouldn't post a how-to video, ask a question and then thrash on everybody when the answers aren't what you wanted to hear. Somebody needs to dig out that butthurt complaint form.
Like my father always said, opinions are like asses, everybody has them and they all stink. Since you don't care what we have to say, here's some more light reading from more apparent theoreticians ...
Steph Davis top-rope soloing system how-to. Uses 2 mini-traxions and chest harness.
http://www.highinfatuation.com/blog/rope-solo-system/From Petzl (website takes a bit of navigation, scroll down and click "self-belay"). Mentions several times that single device use is a bad idea and that any one device can fail. Also has a summary description detailing the disadvantages of the system you use in your video.
http://www.petzl.com/en/Sport/Multi-pit ... K_RcYclsmfTraxion device can fail to lock even when there is not any slack. Thread on supertopo...
http://www.supertopo.com/climbers-forum ... st-tragedyLike I said earlier all of this (top rope and leading) has been discussed to death on MP. Search the forum there for LOTS of info. Here's a current thread right now...
http://mountainproject.com/v/rope-soloi ... /109918715Moral of the story in my opinion is that a single device can fail, and when you're stopping to untie/retie from a secondary strand you are essentially off belay but feel free to do whatever feels safe to you as you're the only person who it would effect.