Drillthrough Should Use Slicer Selections

The drillthrough feature looks very incomplete (i.e. IMHO basically broken/not usable), unless I am missing something. Slicer selections from a summary page don't seem to be carried through to a details page. So you can either use slicers or drillthrough. But not both together in a report. Because if you use both together, the drill through doesn't show you what you intuitively expect to see.
Example:
Data Table (in the data model) has four columns:
- ID containing a sequential number (set to "Don't Summarize").
- A containing values a, b, c
- B containing values p, q, r
- C containing random numbers
The table contains 20 or so records so that every combination of a/b/c and p/q/r is present in the data.
I have a summary report page, that contains a slicer on column B plus a simple column chart with A on the x-axis and sum(C) on the y-axis.
I have a details report page that just contains a table with all four columns in the table, plus columns A and B in the Drillthrough filters on the page.
I make a selection in the slicer on the summary page (e.g. just to select B=q).
I then drill through in the chart, drilling through on the bar column for value A=a.
In the details page, the table is filtered to A=a, but the filter on B=q is missing. So I've drilled through to a different data set.