Hi, sorry for the delayed response.
1. relating to tagging, we don't really have a particular workflow in mind. Before knowing that your team is working on role base, we were thinking of an MVP approach, which is to include in our DataHub starter guidebook tagging best practices. For example
• lower case only
• use _ as space
• spell production in a certain way (prod or prd or production gets confusing)
2) Related to the business glossary- Yeah, our team saw that feature, and we are definitely interested in it given we have fields that are name the same with different definitions OR fields with different names but with the same definitions.