The ATC menu has a lot of similar calls on different pages, like “Say Again” for various parts of ATC. I think the filtering helps not have to fiddle around too much with those, whereas in reality they’re not something you can make mistakes with.
Ideally speaking having an option to have the filtering on or off is the best solution, I think. It doesn’t really impact anything except your own gameplay even in MP so there’s not any harm to it. If I had to pick one or the other I’d keep the filtering, though.