Jonas Windey it’s a con for two reasons:

1. It adds mass to what you have to deliver over HTTP/HTTP2. An author that is using async/await a lot, is liable to create a much larger package right now. At this point, to the tune of dozens of lines of code per async function.
2. It’s more to execute. Those dozens of lines of code need to be called. As I stated, abstraction comes at a cost. More to execute generally means less performance. This isn’t going to matter for 95% of use cases, but when you’re looking at scaling Node or a high performance real time app, it’s extra overhead for no real gain other than feeling good about how the code looks.