iPhone and iPad apps will be available in the Vision Pro App Store by default

eliminating reasons to use a different device increases stickiness.

this guarantees people at least won’t have to (a stretch to assume they won’t) touch an iphone or an ipad while the headset is on their head - the same apps are available, and any using icloud for storage may simply be “the same.” same data, same app, different screen.

advantageous, yes. advantage over others? less clear.

For developers, it means that you’re not writing a completely new app for the platform. You can progressively add features for the new platform to your existing app, and most of what you learn applies to other Apple platforms.

For customers, it means you aren’t taking off the device to use an app that’s not been ported.