OOps.
Point missed.
This thread is all about having two languages on the radio at the same time, and some have advocated having only one language at a time, indicating that is would be simple to say it is only X or Y.
I am simply arguing that it is not that simple.
You can not mandate that everyone speak the same language, because if you choose the language of the country, then international pilots must learn every language on the globe. If you choose some language Y, then you mandate that every pilot on the globe speak Y, even if they never leave their own country. OR, you accept that there will always be the possibility of two languages on the radio.
I am not saying you have to have a radio to fly in uncontrolled airspace, but rather that you can not limit people to uncontrolled or controlled airspace, just because they speak or don't speak the national or international language.
Hence, it's not as easy as saying "every pilot must speak X on the radio".