When developing Region or site level codes, sometimes we tend to create our own functions to complete it; But what if there is a core function which does the same thing and you didn't know of.
Below advantages can be achieved if the common core functions are in your fingertips.
REUSABILITY - Can reuse the existing core function without re-inventing.
QUICK - Since not required to write the function or test it, it will save precious time.
ACCURATE - Since it's a core function and tested and finalized, it is accurate.
CONCISTANT - Since going to point to the same function where ever you are, it will be consistent across the system.
Can you add more detail? I'm not sure what you're asking for.