The problem is, ironically, that each DSL has its own execution platform, and is not designed for testability. Bash scripts may be hard to maintain, but at least you can write tests for them.

In Azure YAML I had an odd bug because I used succeeded() instead of not(failed()) as a condition. I had no way of testing the pipeline without executing it. And each DSL has its own special set of sharp edges.

At least Bash's common edges are well known.