- async-everything, not a blocking language where anything async relegates you to a subecosystem like you have it in basically every other language from Java to Rust to Python.
- simple stdlib Promise that everything uses. no fragmentation between competing byob futures and byob abstractions.
- async/await.
- single-threaded making it ideal for i/o workloads, a crawler being the perfect example.
For these reasons I think it's one of the best languages. Certainly didn't used to be this way.