The problem with speaking Portuguese is also that controllers here can't standardize phonetics, or in the case of Portuguese from Portugal (TAP..) use words that have different meaning, remember when TAP flight landed on the taxiway in GRU? It was the pilots fault at the end but the controller could not help them due to the fact they were not speaking a standardized language to each other...
It's really sad Brazil can't fix this, and make English mandatory on freq, according to ICAO the best Communication quality is in country where English is not native, I think Japan leads, so why can't Brazil do the same?