I'd only like smart windows and lights, since I like low yellow light at night and to open the windows in the morning and to close them later. But I don't like the idea of Amazon or Google having my house (and conversations, internet traffic, etc.) even more at their disposal, that's why I avoid to invest on IoT devices right now.
Also, there's the getting locked out of your own house: https://medium.com/@bjax_/a-tale-of-unwanted-disruption-my-week-without-amazon-df1074e3818b