I agree that PvE balancing should be different from PvE... But like how should that be done is uncertain. And the flyer nerf is needed not only it is b/c the game is better when flyers have fixed movement speed but also 1 less waste attribute for breeders to worry about.
Speaking of flyers, most flyers especially Quetz are completely obsolete at this point especially in PvE when there is hover skiff in the game with easy element source in Gen 2...