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The whole point of an OS is to provide a stable API to use.

This has never been true. The point of an OS is to manage the resources of the computer on behalf of the user.

API stability sometimes serves the end user, and sometimes does not. When it does not, it should not be maintained.

Being able to use the app you want to use serves the end user pretty well.

Yes, that’s the point here. A few end users can use an app the developer has abandoned, at the expense of the millions.