I feel like the way the do it with iPads would be fine:It’s already borderline absurd. Pro shouldn’t have tiers - it should be the best Apple can offer, and as the Max has featured the smaller Pro doesn’t, it should only be available in Max. Then the regular size Pro could be the regular iPhone.
iPad:
- one size
iPad mini:
- one size
iPad Pro:
- 11"
- 13"
iPad Air:
- 11"
- 13"
Done.
Of course, having yet another tier may be at least partially to steer more people toward the Pro Max because with an even higher tier, the Pro Max might appear more reasonable to certain people.