CORRECTION (June 1, 2019): It appears that the latest drop of the New app does in fact support Ecobee Suite. The thermostat device is limited in its UI, but you can control the setpoints and modes (etc.). More importantly, Ecobee Suite Manager appears under Automations, and seems to work pretty well (after I fix a bug in handling SMS notifications).
There may be hope for SmartThings after all 
Please note that this thread is deprecated - the new version is here…