It all boils down to drivers, if those are not open source (and they usually are not), then phone upgradability depends on them
In such cases I usually do a disk image copy after I remove apps that aren't required. That way I have all the files and I can boot it in a virtual machine if necessary.
It supports both, but X is going through Wayland, not a direct support. At least that's how I understand it.
But X support is through Wayland, at just that was my impression. I mean it's not using X11 directly, or is it?
And Zelensky is playing along, probably because he doesn't have a choice between Russian US and half assed Europe.
It all boils down to drivers, if those are not open source (and they usually are not), then phone upgradability depends on them