Maybe I didn't get this across in my original comment, but my primary job is open source software. So I spend ~40h/week working on public projects that are not all my own. I spend tons of time contributing to other peoples' projects, and I authored and maintain a significant number of libraries that are used by other developers.

What I was saying is that it does work. I can use dependencies with no problems no matter what they expose by coercing to promises internally, and have had no complaints about my libraries' APIs use of promises.