OS updates and security updates are two different things. In this hypothetical situation Apple would simply have to keep publishing security updates to iOS 13 as that’s the most recent OS that the seven year old iPhone 6 can run. It does not mean they have to make iOS 15 run on the iPhone 6.Is anyone in the EU smart enough to realize that older, less capable devices with little memory cannot run the newer OS?
Why should newer, more capable OS be required to be dumbed down to run on outdated hardware?