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In working with existing graphics tools to make drawings, something I've come to realize is that overlap is crucial to the workflow: it's easier to draw the line you want by overshooting and erasing than it is to get it precisely drafted. Likewise it's much easier to paint within a stencil mask than it is to stay within the lines freehand.

To me, that suggests the main distinction between source and output formats comes from how/whether they go about decimating the "erasure" data, since the final result produces much more complex non-overlapped paths. The attractiveness of the Bezier usually isn't in the initial definition of a shape - it just happens to be great at reproduction of multiple curves cut and spliced together. So it has the feel of a premature optimization that probably should be reconsidered in making more ergonomic tooling.