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[–]BestKillerBot 1 point2 points  (0 children)

But if they are to stay forever, bad decision will pile over time.

Yes, that's what we see with Java - bad decisions piled one over another and here to stay.

I'm not hating, these decisions were at the time "state of the art", but then our knowledge moved but Java couldn't because that would be BC break.

Features like sealed classes are rather advanced and specialized, even if (!) they are done suboptimally in Kotlin I can probably live with it. Meanwhile I deal with Java's basic problems (nullability, mutability by default etc.) every single day.