Note that there are still a number of limitations to offloading to KMS/display controllers. In these cases Livi should fall back just fine and will just be less efficient.
I hope we can lift them step by step. A few of them being:
only hardware decoded video, not sw decoded
only VA-API or V4L2-stateless, no V4L2-stateful or Vulkan yet (but at least the later should fall in place naturally)
depending on the compositor and hw: only if the display dimensions match the video, e.g. 16:9