My workflow includes:
- scrolling through the master font list and dragging fonts into subjective collections for review
- dragging contenders into a specific project collection
There’s always some wasted effort, because during the process I can’t easily see if a font is already in such a collection. As I drag & drop, I can only watch the collection count either go up or stay the same. 
Proposal
It would be super helpful if the font listing indicated the collections a font is in:
This would save a lot of pointless dragging of fonts that are already included in a given collection.
Also…
Additionally, a filter for “un-collected” fonts would enable easy reviewing of new stuff that hasn’t been placed anywhere yet. (An “untagged” filter would be welcome too.)
Previous mentions:
I’d appreciate any consideration!