Comfort and Convenience
Preferred cabin temperature varies more than people expect. One person is comfortable with cool air on a short run across town while a passenger beside them prefers warmth, so the setting is usually a negotiation.
Safety and Driver Assistance
Setting mirrors and locating the hazard switch while still stationary means the job is done once rather than mid-journey. Drivers new to a car spend their first minutes learning it, and the kerb is a calmer place for that.
Multimedia and Connectivity
Calls in traffic are a common reason to want hands-free audio; conversation moves to the cabin speakers rather than a handset. Whether that works depends on how the phone and system are paired.