to give you quick answers meanwhile,
Metaflow started by targeting data scientists and ML engineers and platform teams. We have been always closely aligned with the needs of data engineering, but given that there are Airflows and others that have targeted data engineers historically, it hasn't been the primary focus.
Now everything is changing with AI. AI is not only built by specialized ML/AI engineer roles, but by many software engineers too. Data engineering is converging towards standard software engineering. Since these fields are converging towards the feature set of Metaflow, we will naturally welcome them 🤗