Sure there are pain points in Java, but I definitely wouldn't want the language to introduce 15 new features each having only a tiny benefit.

Based on your other comment you prefer "fat" languages like kotlin and C# - and that's fair. I find languages with less, but more powerful features far more elegant and while Java has its fair share of historic warts, modern additions are made in a very smart way.

E.g. switch expressions seamlessly support sum and product types, meanwhile kotlin's `when` really is just syntactic sugar.

All in all, with too many features you have to support and understand the complete matrix of their interactions as well, and that gets complicated quickly. And Kotlin is growing towards that.