It is a fact that krita is not designed or intended for making cutout animations.
It is intended for frame by frame painted content animation.
The animated transform masks are a wonderful addition but they are a recent development and do have many UI ‘papercuts’ and some shortfalls from ‘ideal functionality’.
The closest you can get to cutout animation would be to group the parts into a branched armature structure. That would have consequences for computational load, depending on how powerful your computer is.
Here is a linear armature structure animation with an explanation:
Armature Animation (with free .kra file)
A walking body cutout would need a nested group structure to simulate the limbs attached to a ‘root’ object, e.g. the torso and only the root object would have its X/Y position changed.
I intend to make one in the future but not for a while.