Why does the end product of an electronics learning project need to be useful? Or any hobby project? Your criticism was that their hobbies should yield something useful, but where's the "justification" for that? What's wrong with just having fun?

Quarter wits: "How dare you have fun"

Dude. It's a hobby project. It doesn't need to solve major global market problems for you. What an absolutely bizarre thing to get this angry over.

I'm sure many people call you useless, doesn't mean you shouldn't exist