thats literally nothing. slavic peoples can understand each other while speaking different languages. same with the romance languages. someone speaking italian can fully understand someone speaking spanish. the differences between romance languages or slavic languages is the same as the difference between Af Maxaa and Af Maay. also their language families are a lot more recent than cushitic languages. afro asiatic itself is a good 10k years older than indo european. some estimates say that cushitic langauge family are around as old as indo european..
Oromos literally have the same counting system as us and use the same words to count. Then you have the Rendile who can be understood 50% of the time.
europeans are just a lot more related to each other than cushites are