It is quite obvious that devices that embed Linux, Pipewire and for the app tailored tiled wm, Plasma and similar tools are the future of devices of this category:
https://www.youtube.com/watch?v=fZitBeVx3owSelf-programmable MIDI controllers are a category where "the product" does not yet exist for doing anything very efficiently at least. E.g., for an artist OSC/Pilot requires whole team of specialists on tour, so it is not really for everyone, and TBH even that demo is "not that amazing" ;-)
Off-the-shelf self-contained Linux based MIDI device where you could setup similar control widgets on touch screen would essentially replace the team of IT specialists with a backpack (on tour).
Such device could be easily larger than e.g., 1010music's Blackbox [1], and it still would be super convenient and cheap the build :-)
[1] Blackbox is quite a amazing sampler and is about the size of two CD covers piled together.