In our context each User (Entity) belongs to Firm (entity) and each Firm has a category (single select field). We would like to be able to have a smart folder “Category → Firm → User”.
As a parallel - we can already use single select fields as Columns on a Board.
I think @mdubakov has already said that under the hood single select fields are basically entity types. What is needed is a mechanism for converting a single select into a relation field and adding the entity type to the app. That would be really amazing.
Unlike the Board view, hierarchical views are set up from the top to the bottom levels, so single selects are not available here intentionally.
I guess people have a lot of single selects, and displaying all of them in the top-level selector will completely clutter it. All these setup screens are complicated enough (by the reason, of course), and I wouldn’t like to make it worse.
I like the idea of instant converting single selects to real Types (internally we call them domain Types), but we don’t have it yet.