Filter by another two variables that accompany the email table (ex: profile) that also accompany other tables. Essentially, these filters are more like global filters. This enables the ability to create an app for one larger group/community which hosts smaller groups/communities.
For example, an alumni directory for a university with multiple schools (e.g. engineering, liberal arts, etc) where users they can only see others profiles from the same year and same school. For instance, they could have a Profile, Alumni List, & Faculty List. When they login they can see a table their profile, a list of alumni their year in their school (who each have a school & year ID), and a list of faculty from their school.
This will be amazingly helpful from a perspective of data management and also creates many more use cases.