To me all these 'smart' features are hax. They only sound smart, but in reality their performance can't be proven. Tado° wired thermostat works great, but additional 'smart' features are questionable.
My device tells me that my savings with Tado° is 100% (but it is currently disabled, not used, switched off) but if I subscribe to Auto-Assist I will save in average 1.5 times (over 100% ?) as much! xD
When it comes to automation and additional devices, sensors etc. I recommend looking somewhere else. Try Xiaomi or Aqara devices. Cheap as chips and work on Zigbee 3.0.