Comfort and Convenience
Cabin temperature is a preference people rarely agree on. Two passengers in the same car can want different things from the same setting, which is why what counts as comfortable is personal rather than fixed.
Safety and Driver Assistance
Knowing where the main switches sit is easiest to learn while parked, when nothing else is competing for attention. Working it out at speed, in rain or in unfamiliar traffic, makes an ordinary task harder than it needs to be.
Multimedia and Connectivity
Using a phone for navigation drains it steadily, so a long drive raises the question of where it will draw power. Where charging is available in a car, it keeps that separate from whatever handles calls or music.