I understand where you going with the dog being able to get hung up and choke, but that would be the case with any collar. I don't leave my dogs in situations where they have a chance to be hung up.
You are right it can happen with any collar, which is why flat collars are kept lose in our house but with a choke, prong, etc. the time it takes you to get there is so much more limited then when using a nylon. Like I said I am happy you haven't had any issues but the accident mentioned above wasn't expected and look what happened I hope you continue to evade any issues but I am a believer in murphy's law and it always bites me in the butt so I am not willing to chance it.