That is one of my most hated features of modern cars. People don't feel hot or cold based just on ambient temperature, and everything with auto controls makes "blow hot air" far more complicated than just turning a knob.
Mine bottoms out at 65, but sometimes I'm hot and want it colder than whatever it thinks 65 is. It's pretty frustrating. Then it turns on the recirculate, which is not what I wanted. I don't understand why. Maybe the manual says
It turns on recirculation since you want it cold. There is only so much cooling the airco pump can do and pushing in hot outside air does not cool it further. If you want it cold it needs to get cooler air to do so and that is the air previously cooled. What you want is a bigger heat exchanger and pump. Invest in that if you want cooler air.