It’s boring when UIs have a stark contrast; What makes light contrasts beautiful is rarity. Perhaps in the future, extremely elusive UIs with very faint variations will be the top of the design fashion after using cookies to know the user’s tolerance to light contrast.

For example, today’s movies are pitch black because they want to upsell 5000:1 screens. The sole reason it didn’t happen to software yet is because we don’t receive any kickback from screen manufacturers, as opposed to movies.