It's never about languages, but it is about concepts.
I strongly believe that learning different languages will make you an overall better developer if those languages make you learn different concepts.
Such as learning pointers vs garbage collection, imperative vs declarative, single-threaded vs concurrent, dynamically vs statically typed, highly specialized syntax vs generalized syntax (s-expressions) and so on.
Aren’t all those the same but interpreted differently? You have your programming concepts in each and every corner at every level, whether at language, framework, application, or infra.
I strongly believe that learning different languages will make you an overall better developer if those languages make you learn different concepts.
Such as learning pointers vs garbage collection, imperative vs declarative, single-threaded vs concurrent, dynamically vs statically typed, highly specialized syntax vs generalized syntax (s-expressions) and so on.