Whilst I had a bit of a "oh god im so deadly exhausted" moment in the train homewards, I had a bit of a... vision? idea? something like thatm anyway.
See, there is this actually mature Linux mobile OS, SailfishOS. Their porting documentation is what taught me everything I know about both the Android build system as well as how the repo structure (mostly) works. Genuely an amazing read, very technical but organized and structured.
Now, with my knowledge of RISC-V, the company behind the "Imagination" GPUs working towards OSS drivers, and glancing at devices like the PineTab V, I "dreamt" of a linux based soft ecosystem (everytrhing runs the same base OS with the same base apps) across all those devices. SailfishOS relies on Wayland and uses Qt and some KDE Frameworks; and since Qt is actually surprisingly portable and there will be a native GPU driver for the most commonly used GPUs in the RISC-v space - this could, possibly, potentially, actually become a thing.
Well, it could. But now that I have this in my mind, I might buy a PineTab V, take my build system knowledge and git-fu and smash all of it together and maybe make something awesome :)
If you haven't seen SailfishOS, you have missed a gem. Like, literally. When I brought up screen magnification and accessibility, the maintainers were like, "great idea, we'll keep this noted. By the way here is detail on how we implement rendering and where it would slot in" and effectively taught me, within a mere post, all about compositors, window managers and the basics of shaders. xD So those guys are actual madlads.