One tool instead of five
Most creators are stitching together a mess of subscriptions right now. One tool for the video, another for editing, a third for voice, a fourth to keep faces from morphing between clips.
Omni collapses a lot of that into a single model. It processes text, image, audio, and video at the same time, so the output holds together instead of feeling like four apps taped end to end.
My read is that the appeal here is less about any one feature and more about not having to export and re-import your work six times.