I'm fuzzy on Kanban board configuration.
I feel like I don't understand why there is a filter AND a sub-filter for the KanBan boards. We aren't developers so we don't have versions - maybe that is the difference? I see online examples where people put "project = xxx" in the filter and something like "Status != withdrawn" in the subfilter...but why wouldn't I just create one filter that said, "project = xxx AND status != withdrawn"?
Also, I see people saying to put in the filter (or subfilter) a query to remove completed issues after a certain amount of time...but why wouldn't they use the "hide completed issues older than" field that I see at the bottom of Kanban board configuration, general?
I guess I'm looking for best practices.