Windows: Segoe UI Android: Roboto Sans Chrome OS: Noto Sans Firefox OS: Fira Sans Ubuntu: Ubuntu iOS and OS X: Helvetica Neue?
all major operating systems are using a UI font unique to their platform. seems strange to me that Apple, a company obsessed with perfection and design details, would not do the same. especially since Helvetica Neue is incredible generic (and a crap UI font).
anyways, not intending to troll. just wondering why Apple hasn't created a custom font for its OS UIs.