Java does seem to absorb from tried and tested ideas. There are a few major features I can think of that have largely come from or been inspired by popular and mature 3rd party libraries (time, reactive streams and various collection apis come to mind).
Java benefits from more experimentation in the JVM and bigger variety in implementers.
I need to find the funny slide deck by Brian Goetz (java language architect at Oracle) where in slide one (what industry thinks he does) he shows his job is to copy from C# and in slide two he shows what academia thinks he does, copy from scala ;)
It is not this presentation, https://www.infoq.com/presentations/java-futures-2019/ but it is close in content.
C# on the other hand is quite brave and quick to implement everything under the Sun, sort of similarly to c++ - which sooner or later will create a really bloated language (imo, both are already quite complicated). And in backward compatibility, Java definitely wins the cake.
And by the way for the downvoters: there wasn’t any snark, C# itself being at first a copy-pasta from Java, and now taking heavy inspiration from F#. That kind of features transfer in-between languages is a good thing.