Are bird Pokemon needing to have the Flying type most of the time limited? We don't have a mammal type, all birds outside of the odd exception like G-Farfetch'd are locked into the flying classification for no real good reason.
It would be like Manetric and Houndoom having the Dog type added on.
You end up with the Galarian Birds that would have better suits their new type and alt type, not flying added on.