Personally, I'm just not seeing it. The idea of a centralized or master system is old fashioned. People will just buy automation as they need it. So I'll have an app on my phone for my Ring doorbell, another for my garage door, another for my security system, another for my lighting, etc. Google is betting that people won't want this and want an Apple-like experience of just having one vendor perform all their tasks, but people without SV salaries aren't going to casually drop Nest-like prices (total cost of the system with multiple smoke detectors is in the four digits) all at once and they might resent a high level of vendor lock-in. They'll just pick up random automation pieces at home depot for $99 each now and again and just install a new app as needed. Its not a terrible inconvenience and so what if my doorbell can't talk to my thermostat.