I sense a goalpost moving here. The point of the blog post to which I answered to was: I have to redo all my programs to follow the "idiomatic" way.

Now we are at "other programmers could use new features, so I still have to learn them". And yes, that is true. And that will always be true as long as a language has new releases. Even if all those releases were library changes and not syntax changes/additions. The only way to stop this would be to stop all language development.