I still use Koa out of habit since it was the only framework for a while that had first-class promise support. One thing nice about Koa is that it's simple, so

I still use Koa out of habit since it was the only framework for a while that had first-class promise support. One thing nice about Koa is that it's simple, so it's timeless in that way—it's not a moving target nor does it try to do something that needs a lot of core maintainers.