Async code is a good way to achieve some level for performance in I/O bound workloads, but it's a pain for the programmer. Because of that I wouldn't say that it's necessarily a good thing that JS is async-first.

In my opinion, high level languages should not expose async primitives to the programmer - this should be abstracted away by the language and its runtime. Go is doing this (all I/O is async under the hood), and it's awesome: You can write synchronous/sequential code and get the performances of async. I would love if other languages copied that.