I have never said a high likelihood. It's a very low chance with potentially horrendous results.
Getting 'stepped on' happens not infrequently, but so far I've managed to survive it. What horrendous results are you envisaging, Dick?
Whereas
Fly IFR in the USA and the ATC frequencies are going like machine guns with hardly a space to get a word in for a clearance request
is just fine - in fact it's the best, and we should copy it. (Do they somehow do all this machine-gun transmitting without anyone getting stepped on, thereby avoiding horrendous consequences?)
Can I be forgiven for finding this all a bit confusing? Contradictory, even?