If I wish to add painted embellishments that follow modeled geometry, it's suprisingly difficult to be precise, even with the newish Path tool. My goal is often to snap a painted line along an edge, or to snap a brush stroke to an edge or vertex, and I cannot find a way to do this precisely; I keep needing to zoom wayyy in to wiggle path control points around to get the paint to fold around corners and follor edges reliably.