On the other hand,
I’m not so sure about Google’s handling on its Nest product line (or smart home in general) in the long run. They could and would discontinue things, or change things around.
They have done so before, multiple times:
Nest is permanently disabling the Revolv smart home hub - The Verge
Google Discontinues ‘Works With Nest,’ Breaking IFTTT Integrations - Variety
Google discontinues its Google Nest Secure alarm system - The Verge
Sure ecobee might do the same, but at least its track records (so far) are a lot better than Google’s.