In my experience the java profilers and debuggers are still better than anything that's available for rust.
RLS is great on a fundamental level (decoupling IDE from compiler), but it still has to catch up in functionality with the total compiler integration that for example eclipse has with ecj.
You've made at least one person's mood a little lighter today. Thank you.
Kotlin and Scala have Sum types, and Rust still needs to catch up with Scala's type system.
The owners of Java only sue reimplementors that don't respect licenses, like Microsoft and Google.
None of other commercial third parties has had any issue with Java owners.
https://en.wikipedia.org/wiki/List_of_Java_virtual_machines#...
Naturally I am not advocating for you to use Java instead of Rust, rather that it also has its uses in system work, and it is a valid option in scenarios where having a GC enabled language isn't a problem.