Give it to your kid. Plug it into the family TV. Let them learn to hack while you're around to answer questions. Just like when you were a baby hacker in the eighties.
Less software is good - it makes kludging up your own more appealing, and there's a guide to getting started with that right there in the manual.
(Or you could try plugging a goggle-mounted display into it and using it as your personal cyberdeck.)
Hacking into some platform makes very tied to it. I still recall how to program smooth scrolling in EGA/VGA. It becomes an explored world, and is ARM good for being tied to? ARM has an ongoing problem of being proprietary, and RISC-V is to come as a solution. If ARM is neither past nor future, then we should not getting tied to it.
Maybe get ITX-Llama and let parent and kid be tied to all the same platform? Have something common to discuss, something common to play. And MiniMig or Apollo A600 may do the trick. CheckMate Retro IPS display. It is past, but great past. Alive in our souls.
Good news we are not in the 80s anymore. A $200 used thinkpad is much better for your kids to learn hacking. And you can use your TV when they are messing around neighborhood AP.