"Design" is far from my key value metric in a thermostat. When I had my Nest, it looked pretty, but I kept having to re-set the temperature because they'd add some new smart feature that didn't behave the way I wanted to. I ended up largely crippling the crud out of it to begin with.

And of course, after I sold it there was the incident where a server error caused everyone's heat to stop working, so the fact that my pets didn't freeze to death that day made a big impact on me too. ;)