> iOS is locked down in such a fundamental way that any innovation will not come about unless Apple specifically envisions it and designs the OS to support it.
No platform highlights the issue you hit on here like VisionOS.
It is barren. Not just because of the lack of customer base for paid apps, that hurts too, but because the APIs aren't there, and because you can't hack on the private APIs or the hardware directly...they won't be. The app store on Vision Pro is filled with half-assed "spatial computing" consumption apps (Wow, I can put the stock tickers on the wall! That I can only see with these huge goggles on! Neat!), "showroom" apps that are just pure consumption, mostly 3D models of products, and media consumption apps. The games that exist are all pretty lame, and you can't enjoy any of the backcatalog of games written for VR because A. They'd never pass app review, and B. you can only use the PSVR controllers with it, so my Index controllers that I already have are useless.
The Vision Pro demands being as open as the Mac. The problem space is too ill defined and the hardware too packed with interesting use cases to gate behind the restrictive App Store rules. The iPad model worked because it was 2010 and had all the upward momentum of the iPhone to ride. Here and now, on a stagnant, occupied app market where room for innovation is small, on a device with far less promise, the App Store restrictions take all the air out of the room. The entire device is suffocated by Apple's iron grip and belief that they are entitled to own any good ideas that happen on the device, and that they are entitled to 15-30% of any economic exchange happening on the device. Just an utterly kneecapped platform right out of the gate, pricing, specs, weight, and everything else aside. There are no good apps because you just can't write the sort of apps your imagination is likely to want to make. Hell, accessing the main camera wasn't allowed until visionOS 2.0, and you have to use the "enterprise apps" API/entitlement to access it.
Apple's grip has killed it. It is a glorified TV you can wear on your face. It's a very good TV. It's even alright as an external monitor for a *real* computer.