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Probably not, because Apple doesn’t keep track centrally of which features you have enabled on which device, so they simply prevent you from activating the new feature when you have any signed-in device with an older OS version (which is something they do track).

I predict this will be possible

They already communicate to you when you use a newer iOS feature that won't work on your other device. But you can still use it. Maybe you won't be able to turn back on those features on the older device, or something

Which option makes Apple more money?