If you use any of Apple's modern devices, software, services, third-party apps and its ecosystem, WWDC showcases the next major versions of operating system and other software for everything it does and offers.
The "Easter egg" of wired and wireless mouse and trackpad support in accessibility options was left out of the keynote, but so much was packed in that iPadOS is the world's most interesting new operating system.
People are always quick to declare Apple dying, apps dying, the watch useless and more - but Apple has come out with a spate of new software products to prove them wrong.