If you'd like to see an interesting parallel, go look at how Microsoft announced supporting DirectX 12 on Windows 7 for a blessed apps list - basically because Blizzard whined hard enough and was a big enough gorilla to demand it.
If you'd like to see an interesting parallel, go look at how Microsoft announced supporting DirectX 12 on Windows 7 for a blessed apps list - basically because Blizzard whined hard enough and was a big enough gorilla to demand it.
That's one implementation, yeah, just have a list somewhere of approved software and make an artificial limitation. But their announcement is so vague, it's hard to say.
And then the next question is why? It's not like they've ever promised much compatibility for old software on new macOS. Why not let it be just best effort, if it runs it runs?