Filipe Espósito, 9to5Mac:

Since Apple Silicon Macs will have the same processors as iPhone and iPad, Apple will let users download and install iOS apps on these Macs even if the developer doesn’t offer a specific version of the app for macOS.

Key point is the idea that you might have a choice between an Intel-built app running in some form of emulation on an Apple Silicon Mac or an iOS app running natively.

Although by default all iOS apps are available on the Mac App Store for Apple Silicon, the company is allowing developers to opt their iOS apps out of the new unified store.

And there’s the rub. According to this post, not all iOS apps will be available on the new Macs.

If you were expecting to watch YouTube on your new Mac with a native app, you’re out of luck. Google has chosen not to offer most of its apps on the Apple Silicon platform, and this also includes Google Maps, Google Drive, and Gmail apps. On the other hand, the Netflix app for iOS is still on track to be available on new Macs, as well as the HBO Max app.

This is life on a new platform. But over time, older Mac apps will either fade away, or rebuild for the new hardware. Over time, you’ll have all native apps, one way or the other.

Same as it ever was.