The problems with async/await are: 1. The "colored function" problem: http://journal.stuffwithstuff.com/2015/02/01/what-color-is-your-function/ http://journal.

The problems with async/await are: 1. The "colored function" problem: http://journal.stuffwithstuff.com/2015/02/01/what-color-is-your-function/ http://journal.stuffwithstuff.com/2015/02/01/what-color-is-y... 2. Poor interaction with debuggers, profilers, and other tools that expect to be working with normal stacks. Loom solves this because it lets you work with normal threads, but suddenly you can have millions of them in a process without blowing out your memory or other related problems.