Face sunscreen is easy to treat as a beach-day product, but the face is exposed during ordinary routines: commuting, walking, driving, sitting near windows, and quick outdoor errands. That makes daily sunscreen less about dramatic sun days and more about managing repeated exposure.
The practical issue is consistency. A face sunscreen has to protect broadly, layer well with the rest of a routine, feel comfortable enough to use, and be reapplied when exposure continues. That is why texture and habit matter alongside the SPF number.