> You'll be able to match _to_ a trimmed edge, but the edge being modified will need to be a "natural edge" of the surface.

So the ends of Blends, Fillets, Sweeps and Networks should fit perfectly into that requirement.
Now that I think of it, I sure there's some instance, but I'm having a hard time trying to visualize when two trimmed edges would meet.

Often times, I'll do a procedure where after making two Blend surfaces side-by-side, they don't meet and there is often a gap, overlap or both. Because they are untrimmed natural edges, Match would be able to meet their edges square and tangent(ally) with no need to do any further surgery.

...I like. =-)