There’s only 4~5 full time developers on Krita.
One mostly works on animation and spent a long time to rewrite everything about audio synchronization.
Also, he spent a lot of time to fix and improve a long list of bugs/features I’ve opened: I can confirm animation is not put aside.
Next subject he’ll work on I think is audio waveform, if I understood.
So yes, animation is still under development improvement, there’s just a long list of bugs and new features asked by a lot of people; how all of this can be prioritized is quite complex (spoiler: everyone consider his own need as top priority and currently there’s around ~830 opened bugs…)
Concerning the storyboard, it has been implemented by a student during GSOC, I don’t know if the developer is still here working on Krita or not.
May be you can try to contact original developer.
On my side I’ve already got weird bugs with Storyboard but I think the only one I created for Storyboard is so weird that being able to understand what happen sounds complex and probably time consuming…
Grum999