They really should bring back the iPhoneOS name.
iOS alongside iPadOS
is like
fruit alongside banana
Why not:
tvOS
macOS
homeOS
watchOS
visionOS
iPadOS (or padOS)
iPhoneOS (or phoneOS)
Just call the whole lot AppleOS and stop messing about.
Yes clearly the OS's are customised for different devices and are technically different but the vast majority of features are shared and from marketing stand point launching a thousand OS's every September is just horrible.
Next year lets have AppleOS 27. Any device specific features can be described as "what's new in AppleOS for your iPhone' etc.