I dunno - its what I'm using, but I'm at least a wee bit geeky,
Setting up an iPad is obvious because they walk you through each step when you initially start it up.I'm pretty geeky, too, but I found it fairly easy to follow the required steps; they are well described. I accept that it's not turnkey, but any server will require some configuration. Relative to installing, configuring and running linux packages, it's simple...
Obviously, setting up the LMS server requires quite a few settings, but that's true of any server or media app, simply because of the versatility. Twonky, BubbleUPnP, etc. Or many modern apps, or the system management even of things like 'it just works' Apple iPad.
At least piCore has instructions; the 'it just works' approach expects users to 'just know' how to do stuff, 'because it's obvious'. For the devs, maybe, but users aren't devs, and if they don't think in the same way, it can be a struggle.
When I was 15, I'd have loved a 70's receiver with lots of knobs and switches. In fact, I loved my SX-780 when I got it, even though I was actually 13 then. I drooled over a friend's dad's SX-1010 - it was bigger with more conrols. Except for the volume knob, what happens if all the switches are flipped or knobs are turned? No damage will occur. My younger friends and friends of friends love vintage equipment. They ask what each knob or button does and if they can try them to see what they do. Many of us want younger generations involved with audio and don't care for the disposable nature of audio equipment today. What better way to introduce them to it than a fully functional gifted vintage system.Me personally, if my wife asked me about putting a stereo in the bedroom, or in her office at the clinic, etc., I wouldn't be giving her an old quad receiver with a bunch of knobs and switches. Same thing goes with my 15 year old son or 22 year old daughter (who is in Med School); it would need to be easy to work with. So, for my sons "workout room", I bought one of these little Fosi Audio BT amplifiers from Amazon and hooked it up to a pair of unused ads L300c speakers and he just BT's his phone to it and listens to Spotify. It all sits on a shelf and is easy to work with and sounds quite nice as he doesn't care nor does he have a discerning ear. It's not like he's going to sit down and do critical listening....he's working out.
Also, I bought a Wiim device upstairs for tinkering and also stream from a desktop PC and Raspberry Pi4b using Moode/mconnect.
Just a thought for what it's worth.