The phrase 'factory password' isn't quite right. It's usually the default password listed on a sticker on the router. Leaving it unchanged lets anyone nearby jump on your network easily. I had a similar issue years back and found strange devices using my wifi until I changed it.

Actually, it works great for my family's routine.

Respect doing things the simple way without making a big deal out of it.

Absolutely. I fried a motherboard once by not grounding myself. It was during a CPU swap, and I thought it would be fine. The board just died, no warning. Now I use an antistatic mat every time, even for quick checks. Lost a good board over a stupid mistake.