Font Book, macOS's built-in font manager, has seen its icon hugely simplified. Gone are the various typefaces depicting the letter, 'A', replaced with a single clean sans-serif character. Many have complained that it's no longer clear what the app does. "I get the modern take, but this is disappointing, I'd rather have it say 'Aa' than just 'a'," one Redditor comments. Another adds, "hmmm yeah this is upsetting."
https://www.creativebloq.com/design/logos-icons/apples-new-font-book-icon-is-upsetting-designers