Kotlin so crazy with its default-closed, default-final method approach. Do these people even ship software? Or do they ship textbooks? People are acting likely they are writing chapters of Biblical verse with their code—they knew everything better than the user, including knowing what to hide. It’s OK/good to have extensible code, even if the original did not intend it.
To have every class be final by default and hidden from callers might be sane for shipping a library—-but you definitely should not adopt it as internal policy in your own code base, for your own’s sake. Why should I tax myself with having to worry about calling out extensibility by hand at every step? This is just crazy to me!
I’m all for Kotlin’s success as we desperately need something better than Java still. I’m rooting for you.
The lock-in with Go is the massive copy-pasta style and throw-away code mindset that is pretty much all that I see. But there is very little good Go code out in the wild to show us how it’s done.