To be fair It has its uses i suppose. I've had one running pihole since the original pi came out. Used PI2s in the past for OSMC and, even better, ambilight.
I think now a cheap android TV box you can flash is probably better for a simple less than 5watt device.
Besides the HA test I've been trying to use one to be an openvpn TAP interface but it's been a fight and i think you just convinced me to do it in another docker instance on the server and save myself some headaches.
Fixed or not this is good to know. I use a separate device for RAID storage and I think I'll keep it that way. Sorry you had to deal with that. I know if my main storage got wiped by windows installer my reaction would probably make national news.
Will proceed with caution and saved drive images!