Incidentally Suppression doesn't have a channel anymore either. Which means domina can potentially keep multiple enemy frigates locked down at the same time.
Unfortunately, with the current fear of feeding titans, the enemy may not have many front line frigates by the stage of the game domina comes out.
That said, make perseverance a bit easier to use when it's needed and the Domina will be an amazing addition to any advent fleet. Heck, I could see it working to cut 15-30 seconds off the duration to make it omnidirectional if need be. better to have a short duration buff when you need it then a long duration buff which is prohibitively difficult to cast when it's needed.