I do this a lot. pipeline params spawn K number of nodes, that collect just like you drew. No decorator being used here, just referencing tasks by id or name/project. I do not use continue on fail at all.

I do this with functions that have the contract ( f(pipe: PipelineController, **kwargs) -> PipelineController ) and a for-loop.

just be aware DAG creation slows down pretty quickly after a dozen or so such loops.

All the images below were made with the same pipeline (just evolved some names over time) + different parameter options. Including making the "collect results" step optional.