Sometimes we need multiple trees-systems to compare with each other. At this time, neither the list view nor the board view can be completely satisfied.
There is already a similar feature request here: Row grouping and total row in table view
I’d recommend adding your vote to that request as well!
See also this:
Agreed!! Grouping horizontally is only possible in Board View, but horizontal grouping can be super helpful in other views.
For example, using months as databases, client metrics over time in a table view would be fantastic. I think it is similar to the “Pivot” in table view reporting. Not sure.