Use case: A deal/opportunity has a number of roles that are fulfilled by contacts (e.g. Project manager), however, one contact can play different roles in different deals, so it doesn't make sense to add it as a custom property on the Contact object.
Adding a field that references contacts in deals would make this possible (much like the Hubspot user field, but for contacts).
Great idea, especially applicable if you have multiple deals with different contacts on different sub-teams but all under the same company or different companies.
