If simplicity and non-Python-centricity matter, I encourage folks to look into Digdag [1][2].
It's Ansible for Workflow Management.
While both Luigi and Airflow (somewhat rightfully) assume the user to know/have affinity for Python, Digdag focuses on ease of use and helping enterprises move data around many systems.
If we learned one thing from today's S3 outage, it's not enough to use multiple cloud infrastructure providers: you should probably have your data in multiple cloud providers as well.