It may not always be obvious what triangulation most likely approximates the world, but when we see a bad break line we can pretty easily establish that it's pretty bad.
For my working example, I've been working on a terrain model derived from a cross section survey. The points don't perfectly follow a straight line. So the default triangulation sometimes connects two points on the same cross section. (Sure, it's conceivable that they are supposed to, but in my case I know that's not true.) Like I said, it's not immediately obvious to me what the best break line is, but I know it's not that.
I'd like to construct a line and add it to the terrain model so that when the default triangulation establishes that as a break line, it will reject that as a valid break and will find the next best way to triangulate.
Now that I think on it, we have contour element option. I'm not entirely sure the applicability of this in my case (I never have used it), but just as we have that option as a terrain source element, maybe give us a cross-section element option that will reject any possibility of connecting any point to any other point on the same line. One issue I can think of right now is if a cross section line curves around enough that there is no reasonable solution that avoids all points on the same line. Perhaps an error message could be presented in such a case. Then it would be up to the modeler to sort out a better solution, including breaking the line where appropriate.