It was a long ass while ago, but that's my point.
Between her introduction and OYL, Cass was rarely if ever used outside her own title. Dick and Tim coasted into other books like it was no big thing, but not Cass. She never got an arc in Gotham Knights, was little more than a cameo in Superman/Batman series and never had much meaningful interaction with the rest of the Bat fam outside of Oracle.
She was, IMO, the red headed step child. And obviously, while it was worse under Dan D, it is still true today.
Still no teamups with the rest of the fam, no real relationships developed with characters save the existing ones (or Duke, but they could hardly avoid it with that crappy Outsiders book), nothing.