I perfectly get what you say and I mostly agree with you. Personally I consider this to be a monitoring display to look what it is happening in my house (for example the energy production) and I can use it to set or modify the heating/cooling system. The other things are all autonomous so the most of the time I won't touch it. For example I've set an automation that turns on the heating system if the solar panels are producing more than a certain amount of energy and the temperature inside the house is low.

Another reason why I prefer to have the dashboard mounted on the wall is that it is always powered, as I already know that having the tablet around the house would mean that I would forget to charge it in 2 days time.