^^^ why? That is how a lot of big airlines around the world are or have been structured, why is Air NZ so special that Jets and Turboprops shouldn’t be mixed?
And what makes an SO seat so special that it gets paid enough money to ensure a good chunk of pilots would rather sit there than move to an A320 FO spot?
These are genuine questions, as apart from ‘losing the higher SO pay’ for new joiners and or ‘a bigger list so longer wait times’ there doesn’t seem to be a very good reason to be so scared of this change.