I believe Swift 3.0 is the last breaking release. Version after this will avoid breaking the API and language as much as possible, and I imagine allow backwards compatibility for changes they do make.<p>I&#x27;m okay with the fast-moving nature of Swift. It&#x27;s a very young language that obviously needed a lot of changes, and if they had to take the time to make the earliest features available all the way in version 3, Swift would already be bloated. But they have been able to do away with backwards compatibility which is difficult in the industry, and I think it allowed them to make a richer language, not held back by anything.<p>Side note: For at least some of the changes they&#x27;ve made, they&#x27;ve also built into the compiler and Xcode smart error messages that see the old syntax, and allow you to click one button to fix it to the latest syntax. Such as the old `for i in 0..10 {}` to the new `for i in 0..&lt;10 {}`, Xcode will tell you to basically insert the `&lt;` for the new operator.