One of my favorite things every WWDC, back in the day, was checking to see what, if any, new language features we got in ObjC. Even so, that was a rare occurrence, and you could probably count the major language shifts on one hand

Today, I love being on a language, Swift, that gets new goodies to play with every single year, even if 90% of them don't apply to me. It took a while for Swift to get to a place where I was happy to move to it, but I would never look back now

https://www.hackingwithswift.com/articles/277/whats-new-in-swift-6-2