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Swift has largely stopped making source-breaking changes.

Personally, I find the intense focus on API/ABI stability and legacy support in the software world to be a major blockage on the road to great software. I'm ecstatically happy every time a new version of Swift makes big breaking changes, because it means that people care a lot about making Swift excellent, and as somebody who has used many different languages and frameworks, I can tell you that care is acutely felt in the experience of writing with Swift and Apple frameworks. I'm paradoxically kind of disheartened to see it reach stability. I wish this went on for a couple more versions.

2 to 3 was brutal. Otherwise totally fine.

I had to make two changes to update from swift 4.2 to 5 and they were both trivial tweaks to fix warnings, rather than hard errors.

Each version up to 2 had a lot of language breaking changes, 3 had incredibly rough standard library changes, and everything since then has been about 5 minutes of work.