I wouldn't call 6 years a long time for support. Imagine if Microsoft announced that any software older than 2020 will not longer work. Not be out of support or not get any more updates, just become not runnable.

The problem I have with it is Apple unilaterally deciding that support ends. I don't see the harm in no longer supporting it but leaving it as an option for legacy support. No garentee that anything will work with it and no support for it. They've done this with their hardware before but here it's just a cudgel to force devs to update their apps.