Dev time and python3 with no dependencies, so the deployment story is as simple as Golang (since python3 is part of Debian base). iOT sensors and relays aren't complex systems compared to your average enterprise web service, and it's not like they need to scale behind a few readings per minute at most.

People are of course free to spend their time as they wish, but I'd rather solve it efficiently and move on to things I find more interesting and challenging. "Good enough" is great.

I fully endorse spending time as you wish. I do however not understand the interest in home automation. "Good enough" to me is walking over to the thermostat and changing it if I'm too warm or too cold. This is almost never. I set a temperature that I'm comfortable with and then forget it.

Same with lights. If needed, I turn them on when I enter a room. I turn them off when I leave.

In my car I can't stand "automatic" climate control. It never works properly. The best system is one manual dial for fan speed and one dial or slider for heat with an on/off for AC. Simple, reliable, and adaptable to conditions that are outside the parameters of the automatic sensors and programming.

Spoken like a true engineer.