My only criticism is that Ruby doesn't need more features.
ES6 suffers from this disease to a fairly extreme degree, and you can see this schism in the JS community back to the semicolon war in the early 2000s. Kotlin as well, unfortunately, as it's otherwise generally a really nice language.
There are so many language structures and shortcuts. And unless you spend a large amount of time becoming truly fluent in all of them, you're never going to be able to read all the "clever" code that uses them.
These structures are not common across languages, either, so if you jump between codebases in multiple languages... good luck.
The one feature Ruby absolutely needs is proper modules and libraries, like Python and Javascript. The current system modifies global name space and interpreter state, it's essentially #include from the C preprocessor.
ES6 suffers from this disease to a fairly extreme degree, and you can see this schism in the JS community back to the semicolon war in the early 2000s. Kotlin as well, unfortunately, as it's otherwise generally a really nice language.
There are so many language structures and shortcuts. And unless you spend a large amount of time becoming truly fluent in all of them, you're never going to be able to read all the "clever" code that uses them.
These structures are not common across languages, either, so if you jump between codebases in multiple languages... good luck.
tl;dr: Readability über alles.