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After 16 years, Ecobee is shutting down support for the original smart thermostat
(www.theverge.com)
This is a most excellent place for technology news and articles.
As per the Ecobee notice this only impacts the two original models and they still function as regular thermostats still, they are just not providing any of the smart / cloud features anymore.
Newer units support local homekit control, which can also be paired with open systems like Home Assistant for full local control for automation.