1) Market disagrees with you strongly, hence hundreds of millions of people using it regularly.

2) He's just having fun, working on a side project that's useful to him, and learning. Nothing wrong with any of that.

Why so negative?

1) Popularity is rarely an indicator of quality.

2) That doesn't mean it isn't over-engineering.

If actually being used by people isn't part of your criteria for a good medium, then I'm not sure it's very useful.

Adding Wi-Fi control to your garage door using a WeMos is not over-engineering. It's just a fun little weekend hack.

Over-engineering is what I did...

- Raspberry pi

- Open/close sensors on the garage door as well as the side-entry door

- Camera pointed at the side entry door taking photos while it is left open

- Push alerts to my phone if either door is opened between specific hours of the night (Break-ins to detached garages were huge in my neighborhood)

- Voice controls from my fucking phone to open the door

I sold the house otherwise it'd probably be an even larger monstrosity today

That sounds really cool. One of the advantages of owning your house.

Over-engineering can only be assessed based on the goals of the project, which he hasn't detailed.

70 lines of code is over-engineering? That's nothing.