Re: E for effort
What on earth are you talking about?
I mention simple basics and you go right over the top. It's a completely different board layout already so what's the big deal?
Audio - doesn't have to be fantastic but what kid doesn't like to make some interesting noises (big kids too). The chips for 16bit stereo are at almost give-away prices these days.
Storage - the micro SD cards don't have a good track record for lots of reads and writes, so most people plug in a USB stick, which uses up a socket and sticks out so it's likely to get knocked and stress the socket. You can get a tiny SSD almost for pennies these days, both SATA and PCIe.
PSU - You've got to have one anyway. If I had a pound for every time I had to deal with a missing, broken is simply under-rated wall wart I'd be rich! A lot harder to go wrong if it's built in, and the PSU itself can still be fully enclosed.
With all of the above, this unit is aimed at tinkerers and kids. Neither are known for their delicate handling of gear - especially the kids!