Most of these points would apply if you use phone in your car for navigation, and most of them are not a real issue (expect being a distraction maybe).

Screen is good enough to be used in a sunny day, phone will easily reach more than 35 degrees if you play a graphics-heavy game, so this is also not an issue, battery with a battery saver mode will easily last for a few hours even if you use Google Maps all the time, and with a good mount there is a zero chance you will drop your phone and break something.