Earlier quoted context omitted.
I'm speaking in a broader sense, comparing the variety of other Arduino boards like the Uno R3/R4. That wasn't too clear in the OP, sorry! The concern I have with the $44 Q is it has 2GB of RAM and 16GB eMMC, and a processor that's probably between a Pi 3 and Pi 4 in terms of speed and IO (though 4nm, so probably much more efficient). For $45 I can buy a Pi 5 with it's own built-in GPIO, PCIe, and a much faster SoC,…
There are some advantages to Arduino. Like This _is_ possible with Linux, but not at all trivial and likely impossible with general-purpose distros. Interrupt handling and (on RP2040) dedicated multicore code is also nice.
I assume initramfs-only with special purpose pid0 and only the modules needed statically compiled into the kernel?
What else would it take?