Indeed, however there is no technical reason why devices couldn’t be built so apps could be lift and shifted verbatim. We already have examples of cross platform frameworks that can target desktops as well as mobile devices. We have an understanding of how to reflow our content for different screen sizes, orientations, aspect ratios, and even (albeit less successfully) DPI. We also have platforms were code has to support different horsepower (eg games written for the Nintendo Switch between docked and undocked mode). So we understand the theory and I’m sure most developers would welcome such a change too. But there is absolutely no incentive for hardware manufacturers to do this (and I can’t blame them either).

To be honest though, I’m less concerned about app portability as I am about retaining ownership of apps after their or the app stores support has ended. While this doesn’t really matter for mobile apps nor music streaming services, it’s something that really concern me with regards to collecting retro games. There is a lot to be said for owning physical media. But I’ve digressed.