I find it frustrating, but regrettably it is understandable, that accurate splits are not a mandatory part of our measurement process. I generally refuse to just measure 'start to finish' and leave race organisers to lay out the splits, as they will almost always get them wrong. Even when I do measure accurate splits, inexperienced organisers often don't bother to place their kilometre signs in the right places.
Inaccurate spilts result in runners questioning not only the splits but the overall distance. There is no doubt in my mind that inaccurate splits are far worse than no spilts.