Sort of: The point is that these are no splines per se, these are loose edges (not part of a polygon) with a subdivison modifier applied to the object. And yes I connect them via "Make Face" (or "Grid Fill" if its a larger patch). By doing so these edges become just part of the polygon so no additional deletion is needed.…
A implied curve/solid behaviour but essentially an explicit parametric polygonal workflow?! Which can be advantageous in terms of streamlining a freeform visualisation of the object in question, especially hard surface content, either working from refs or not.