Please review the Pivot feature of the following tool:
Basically, it is like a subgrouping or sub-rows in a board view. This concept can be applied to the rows of the board views for very powerful all-in-one views. Currently, achieving the same result requires creation of multiple boards in Fibery.
The same concept can even be applied to columns of a board and also in list views in future, but just row pivoting will be extremely useful.