I'd say the limitations are relative to your use case: `docker build` works well enough in most cases, but sometimes it's not the right tool for the job (e.g.,

I'd say the limitations are relative to your use case: `docker build` works well enough in most cases, but sometimes it's not the right tool for the job (e.g., you cannot use `docker build` inside an AWS Lambda, you can get way better performance from specialized tools in some cases [1], etc) [1]: see my sibling comment at https://news.ycombinator.com/item?id=48301041 https://news.ycombinator.com/item?id=48301041