So do remember that this is a Toyota, not a Subaru. It use’s Toyotas safety sense 3 or something like that and not Subaru eyesight. Eyesight requires two cameras at the top of windshield, solterra only has one. With that being said, adaptive cruise control should always be treated with caution and never 100% relied on. In normal conditions I’ve had it speed up when a car is right there and I’ve had to put the brakes as well but that’s expected as it’s not a human driving, it’s a computer getting data from cameras and the data could be misrepresented by the computer thus creating wrong driving decisions. See Teslas and phantom braking, it’s the cars camera picking up shadows or being blinded by light creating a wrong scenario for the car and making a wrong choice. Your front radar is the plastic circles all around the front bumper. Make sure those are dried and clear. Yes sometimes snow and even heavy rain can obstruct the radar and camera at times. You should never rely on tech and advanced safety features in poor weather. In those conditions, rely on yourself and the brakes at all times.
What’s your problem with ACC? As in the 12v battery can drain if left in ACC mode for too long? With EVs we have to get out of the ICE mindset. Just turn the car to the ready position but in park. It won’t eat traction battery if it’s not moving or using heat and your 12v will stay trickle charging as well. With this being said, Solterra is not for everyone. There are plenty of short comings of it and while it has Subaru badging you have to remember it is in reality a Toyota so comparing it to other Subarus will not be an apples to apples comparison.