Pogel Adler wrote:and the fact it uses splines is also helpful. (If you don't like a line, no need to redraw, just adjust it)
However, if you draw seperate lines, it'll be hell to do the fills. The only reasonable method I've found so far is to redraw each fill manually.
I had this problem too, until I began using the Auto Weld script (in Moho menu Scripts -> Other -> Auto Weld), which tries to close minute gaps in your outline.
The disadvantage of using a single layer and animate by changing the existing curves is that you're stuck with the points you've put there. If you want to add curves at certain frames, but not want them to show in other frames, you'll have to render them invisible by either manipulating the alpha channel, or putting the curves in a separate layer and manipulating the visibility of that layer. IMO this is too technical and hinders creativity.
So the best advice I've read so far in this forum for traditional animators wanting to use Moho, is to use switch layers to animate separately drawn (grouped) vector layers (or bone rigged vector layers, which in some cases is even better than mere vector layers, because it approximates sculpturing so much -- which seems to be a good thing in character anmation).