Associating contacts would make my life so much easier. I work in a school context. We often talk to both Mum and Dad about enrolling a child.
Sure, we can merge email addresses to create a single contact, but that destroys the record of one of the parents. Then, the next time the ‘other’ parent contacts us from a different email address, we’re back to multiple contacts for the same child’s enrolment. It gets very messy…