We don't disagree here. There are tools which support you in doing this, and I mentioned a few of them in my post (Make, Just, doit, mage). There are many more.

We don't disagree here. There are tools which support you in doing this, and I mentioned a few of them in my post (Make, Just, doit, mage). There are many more. I also think that re-inventing these tools is a waste of time, but it is still better than shoehorning this into YAML. You seem to think YAML is some kind of DSL for pipelines. It really is not.