Contract Type for future selling vs. selling now?

Summary:

Why differentiate Contract Types (Agreement vs. Enterprise Contract) based on future selling and selling now?

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Referring to document:

It's recommended to use Agreement class if it's selling in future, and use Enterprise Contract if selling now. What's the reason for this recommendation? Would there be a problem if I create a Contract Type with class Enterprise Contract for all types of Selling Contracts regardless of selling now or future?

Version (include the version you are using, if applicable):

23D

Code Snippet (add any code snippets that support your topic, if applicable):