As far as I can tell, Airtable does not offer the ability to create global fields (within an Account) that can be reused across all Bases. This is a critical feature if I’m going to create a Field that would essentially be reused in multiple Tables across multiple Bases.
The primary idea for a Global Field is to create it once, and reuse it multiple times. Additionally, if I add/remove items in the field (e.g. a Select Field type) then all tables using that field would be updated automatically.
I realize I could create a template and then all future Bases could be created from that table, and hence include that field, but this does not cover the field update scenario.