Because every car I've driven with digital climate control - which includes Seats, Porsches, Ferraris, JLRs, Maseratis, Astons, and a Mercedes delivery van - to set a constant in-car temp irrespective of ambient temp, the process is the same: select Auto, select desired temp, let the system control the in-car temp. For example, enter the car during a 30°C ambient summer day, select Auto, set the temp to 20, and initially the fan will blow like a tornado, then gradually diminish to almost now't as it lowers the in-car temp to 20.
Is a Lexus / Toyota system different?
Ta 🙂