Allow tables to be stored into FeatureDataset
https://community.esri.com/t5/data-management-ideas/allow-tables-to-be-stored-into-featuredataset/id...
Reference:
thinking workarounds?
for any "table" you want to include in a feature dataset,
- give it a couple fields for x and y coordinates
- calc them both to something like = 1 or even lat/long to "Null Island"
- make it a point feature class and add it into the feature dataset
that will give you access to the "attribute table"