When Apple releases new versions of MacBook, both the Air and Pro receive the latest chip available (in this case, M4). However, when new versions of iPad come out, the Pro gets the latest chip but not the Air: in fact, this year, the Air got a chip two generations behind (M2 vs M4 for the Pro). I'm not sure about the reason for such a different strategy between the two product lines. If I were Apple, I think I would favour something in between: a one-generation gap between Air and Pro, with both being released at the same time.