1) iOS for phones 2) iPadOS for tablets 3) MacOS for computers
Google attempt to use one OS (Android) for both phones and tablets will result an unwieldy API for developers and confusing experience for users.
Rather than trying to build 'one size fits' solution they should aim for 'right tool for the job' strategy
Chrome OS and Android are much farther apart, both in terms of API (web apps and Android are very different; iOS apps can run unmodified on newer Macs, for example) and OS implementation.
And it no longer runs like the original chrome os did way before (simple and lightweight). It needs to be in the $600 price category to be decent.
Desktop Mode in Android 15 looks like a move into a desktop set up.
With side loading, nothing really prevents you from doing development on Android apart from the poor UX. Technically, I’m fairly sure Google could probably easily give you access to a full sandboxed Linux environment if they think it’s a good idea.
In a nutshell schools benefit from a a simple, restrictive, laptop device that runs the web well.