What I'd like to see is open standards for smart phone software: standard ways to have drivers with a stable ABI and API (the goal here is to decouple specific OSes or kernels from specific hardware, if the drivers are free that's even better but is not needed for this goal), a standard way to write data to the internal drive and to boot from internal and external drives (UEFI could work here), and bootloader locking being a thing of the past. We have this or similiar for desktops and laptops. The result of this is that I can run any of hundreds of options for my OS (any major Linux distribution, various BSD options, Windows, and more) even on very old hardware.