I think it solves a problem that shouldn't exist: managing complex state in an operating system.

OSes should be mostly immutable. Apps should own their state. Everything else should be in a neat tidy box that is portable. Mobile almost gets this right.

The idea of installing things "on" the OS needs to die, badly. It's a security and privacy nightmare because it means everything more or less has root, and it makes every OS install a special snowflake that is under the hood a giant mixed pile of shit.