Why is every Epic implementation different?

There is a famous saying

Epic implementations are always different at every hospital. Why is that? It comes down to the fact that Epic is a comprehensive IT system which broadly covers the function of managing all the work flow processes within a hospital. That is not a simple problem. Eliot and Jacob talk a little bit about this question:

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Epic is like salesforce - both products allow their users to implement their own data-structures and custom screens to implement unique workflows for their organizations.

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