4 things based on my experience of using the techniques I described for about the last 7 years:
1. Sometimes, the friction on larger spars can be a little too much, but this is easily avoided.
2. The amount of times 'cross loading' a krab is refered to in this application, shows so many don't appreciate a few fine points that makes it no issue. The tests I've seen don't replicate what happens in reality. Certainly in my system.
3. The karabiner can be gauranteed to release the friction hitch in a barber chair. You just have to know how.
4. I've never snagged a biner during retrieval.
I'm not saying anything against the monkey tail - each system has pros and cons.
I'm just pointing out that there are safe, simple and effective alternatives that I've used for years, based on nothing more than a FC already installed, or a lowly karabiner. That to me is KISS - Keeping It Safe 'n' Simple.