Because most of Apple's designers do not have the discipline or the blessedly smaller scope to consistently output well designed interfaces anymore, and are riding the momentum of those that came before and the current of hot air of their own supply these days.

The idea that Apple is full of good designers should be forgotten. They're as mid and sloppy as any other large tech company.

Even worse: why do they use high/low based on calendar date rather than daily high and overnight low.

During a cold snap one cold night will show up as the low for two consecutive days instead of a single “overnight”