What if you create a truly unique routing profile that's wildly different from the common ones for which shortcuts were pre-calculated? The system is smart. If it detects that too many shortcuts (~50, for example) need on-the-fly recalculation and deviate significantly, it might determine that falling back to the original, comprehensive A* algorithm for the entire route would actually be faster than doing many small, heavily modified A* calculations.
The answer was the US Navy, which was hungry for new pilots after World War Two. It was not building rockets but at least it involved flying.
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installed in banks, the compatibility choice created a situation where many of