Starts making a lot more sense when you try to forsee the future product lineup:
# Was
iPad Mini 2 (7.9)
iPad Mini 4 (7.9)
iPad Air 2 (9.7)
iPad Pro (9.7)
iPad Pro (12.9)
MacBook Air (13)
MacBook (12)
MacBook Pro (13)
MacBook Pro (15)
# Becomes
iPad (9.7)
iPad Pro (10.5)
iPad Pro (12.9)
MacBook (12)
MacBook Pro (13)
MacBook Pro (15)