They were also more specifically authored by the same individual!
Maxime, the original author of Airflow/Superset, is also the CEO of Preset (where I work), so he/we are still working on Superset every day :)
Oh that's awesome! Must be awesome to work on that. We've been using Airflow in production for 6 years at this point with various clients and it's been great, and we're trying to sell people on Superset now as well.