It will solve some, but not all problems. What should happen in the case, where a street has two dead ends and a crossing in the middle?
In that case, it won't be trying to leave the way at either end. Perhaps, it will work OK - only one way to find out.
I feel that your patch solves the sympthoms, not the unknown base problem.
But we don't know what the problem is, yet. Why not try the patch? If it doesn't work for the situation you mentioned, we can try something else. If it breaks other things, we can try something else. Adding a node to the end of dead-end ways may be what's required but that will bloat the map files when it may not be necessary. Ha, that's just jogged a memory, this is what Steve wrote the other day:
However, the NOD section is much larger on the MP version; it contains fewer roads but more routing nodes.
I assume that the different number of roads is differences in how they are joined together. I can't see or think why the number of nodes would be different.
I think we know where those extra nodes are being used, now. Cheers, Mark