Certainly not the "one way to write it" idea. Java has a ton of language features.

Not really. It has a pretty bare bones OOP (single inheritance, interface), primitives and objects, generics and pretty much that's it.

Newer features fit very nicely and didn't increase the language surface (records are just a normal class with some methods auto-generated, while sealed types are just a restriction on who can subtype an interface -- and yet these give full ADT support for the language that improves readability and type safety).