These dungeons were not just scaled, some of them were broken. For example Imiril and the last boss of banished cells cannot be blocked. All their attacks go through block, and the last boss is unrefl
I personally am not sure if scaling works as intended. We had could hardly kill Keeper Imiril in BC veteran mode (the one with the orbs) scaled to VR 1 as VR 13 (me) healer and 3 VR 14 people, I think
Ran BC at Vet 10 as the healer the other day with three VR14's, some in trials gear. They couldn't get enough DPS on Imiril or the Daedroth's at the end. I have doubts that they were not built for