notapilot15
Your handle says it all.
The english language is still used on aerodrome ground, tower as well as most arrival, departure and en-route ATC frequencies.
There are very few areas in the world that actually use CPDLC albeit it is increasing very slowly.
Therefore it is just as important now (if not more) than it ever was for proper use and discipline of RT and comprehension of English as applied to aviation.