@Apileofballyhoo
That's potentially 900 engagements a year that won't able to be done.
It seems odd - why the push to slim it down if these engagements and patronages are important?
I think the slimming down would have been substantial, but not as drastic as it now will be.
If you think that when these discussions were happening you'd have had - Queen, Philip, Charles, Camilla (maybe not at the beginning), Anne, Andrew, Edward, Sophie, Alexandra, Gloucesters X2, Kents x2 and Margaret. Plus maybe QEQM depending on the timing.
So the slimming down was primarily about the potential additions in the future - William, his wife, Harry, his wife, Beatrice, Eugenie, Louise, James, his wife and potentially any other children had by Andrew/Edward.
I think the "slimmed" monarchy when Charles took the throne would have been Charles, Camilla, William, Kate, Harry and Meghan as the main line full-time royals. With Anne, Andrew, Edward and Sophie has the outlying workers. So a drop from 15/16 to 10. With William's children replacing the 4 outlying ones in time and Harry and Meghan eventually becoming outlying royals.
Whereas now because of the various situations it'll be Charles, Camilla, William, Kate, Anne, Edward and Sophie.