"Rjek. If every new feature was made freely available to all previous users, then where exactly is the income to pay for the development to come from? If users want the latest features then they need to have the latest version of the OS. Everyone gains in that scenario. If developers don't use new OS features because not enough people will be able to use it, then no new software will ever be developed."
Are you being intentionally obtuse? I've explictly said that user-facing features shouldn't be; only APIs should be if you actually expect software to use it.
Try reading for a change, rather being deliberately argumentative to make you look powerful to the last few remaining people who think you're relevant.