[barista]

Only the new apps that use features (e.g. native support) not available on older phones will not work on older phones. Is that not how iOS and android upgrade too?

[onetwothreefour]

No, that's not how iOS or Android upgrades work because those companies specced out their platforms before launching them to market.

You can't just "add native support" after the fact. That's a major addition which should have been there from day one.