I don't see how it's comfortable, or even safe, to unclip when your foot is up by your knee! I've had to unclip in the 12 position in emergency stops, but it feels totally wrong and awkward. I've been riding for 12 years or so and while I'm not an expert, I wouldn't teach anyone this way. Of course, people need to do what works for them, but it just seems like it would put most people off balance.
2015 Trek Silque SSL
Specialized Oura
2011 Guru Praemio
Specialized Oura
2017 Specialized Ariel Sport