I find I frequently look at the "My Connections" button on categories (migrant voyages, cemeteries, towns). Sometimes, I pick the most remote connection and try to reduce the number by finding a missing connection (eg adding a spouse and connecting his/her parents as well).
If there are less than about eight profiles in the category, it's obvious if the connection list is shorter, but if there are over 50 profiles, it's hard to notice there are unconnected profiles, and even harder to work out who it is.
The page has "Ancestors and Cousins" and "Connections" sections, sorted by connection length. I'd like to request a third box at the bottom for "Unconnected" or "Connection not found" to clearly identify profiles in the category but not in either of the other lists. This would work as an invitation to try to connect the unconnected profiles instead of losing them from that view.