I can't understand how anyone can think that not being able to understand everything going on on the frequency would not impact situational awareness. I flew UHF only military aircraft for 16 years and was very frustrated at not knowing what was going on around me. I have flown in Central America and Europe and not been able to understand the Spanish or French. I have also spent A LOT of time flying in and out of ORD where I was really glad I understood all of what was being said.