Is one smart weather sensor enough to control my entire house, for all weather sites?

Yes, in most cases a Smart weather sensor is indeed sufficient, because the sensor not only knows the brightness, but also calculates the position and height of the sun.
This gives you the option of using different threshold values to first close the shutters in the east, later in the south and in the afternoon in the west.
If you use the Smart weather sensor to protect your awning from the wind, you must ensure that the sensor also detects the relevant wind for your awning.