Thanks. Ive lived here all my life and never needed to dehumidify my air.You’re correct that in moderate temperature, high humidity conditions, a system that prioritizes comfort over efficiency will cool the air to dehumidify it, then reheat it so as to not overcool the cabin. Teslas do this.
Vehicles with a heat toggle/button will sacrifice occupant comfort in exchange for better range - at least when the driver disables heating. They’ll ramp the compressor down to maintain a comfortable temperature, but in doing so, they don’t dehumidify as well due to the higher evaporator temperature. The evaporator surface temperature must be below the dew point in order for it to dehumidify.
Thought it was such a weird thing when I was installing my home Ecobee and it asked if I wanted it to dehumidify the air. "Now why would I do that?"