Depends on the workflow. For one off jobs or client tooling, parallelism makes sense to have rapid user feedback. For batch pipelines on that work many request

Depends on the workflow. For one off jobs or client tooling, parallelism makes sense to have rapid user feedback. For batch pipelines on that work many requests, having a serial workflow has a lot of the advantages you mention. Serial execution makes the load more predictable and makes scaling easier to rationalize.