Importing image sequences as an animated layer should be a no brainer. To fully use Krita as an animation tool it should be possible to import videos or image sequences.
It's critical for most animation works to be able to import line tests or video references, whether it's for animating, doing clean up or painting frames.
Right now rotoscoping, a pretty standard and basic animation technique, is impossible to do in Krita.

Importing footage is an essential option of any animation software

Reproducible: Always