@inference @thor That feeling when you see a malfunctioning sign and can tell it's Uboot running on a RasPi just from a glance. I love embedded systems. I will do teardowns on equipment that I've bought before even testing it.
I like other things but computer hardware is always enjoyable to inspect. I've offered advice in the past and I wouldn't mind doing it again.
Building custom PCBs seems rather pointless for most things. I would consider it to interface with something I have no other way of connecting to. There's also the case of a board that does things I don't like.