I've been working to use Pivot & Data Mesh to replace most, if not all, of my complex "summary sheets" where I have tons of cross-referencing formulas to pluck and calculate all the information I need from source sheets to trend KPIs. I love that pivot tables are dynamic, and update at my chosen cadence. For example, it will add in a row or column with any NEW values added to the list I'm looking at; as opposed to one of the Admins having to remember "oh if I add a new value and we have any charts on any dashboards that look at this list, I have to go find the widget data source and add this value manually" etc.
A source of frustration has been that if I have a dropdown list column where multi-select is allowed, I end up with unique rows or columns for every combination the user selected. In my summary sheets with formulas, I was able to use CONTAINS or HAS to accurately count. With the Pivot table I can't.
Here I'm showing an existing summary sheet I have which looks for and counts using HAS:
Versus here using Pivot, the one "Doc Updates (Ref Docs, WIs)" category has tons of rows, one for each unique combination (and is not only not what I need, but I can't figure out a way to get what I need from it!):
I'm positive I'm not the first person to run into this and I wanted to see what the community has done to overcome this limitation of Pivot App functionality.