If you were looking for an outcome to have zero cases show up that could be infectious to the community, then, yes, you would go with the 14-day approach. You would miss one of 100, going down that road.
You know, when the CDC focused on shortening the quarantine period, it was accepting that a 14-day quarantine is hell for a lot of people. It is very difficult. You want to incentivize people to do the seven days properly rather than doing seven, taking a quick trip to the grocery store at day 10, and then.... You know what I mean.
If you were going for just numbers, then, yes, the 14 days would be adequate. If you were going for practical compliance of a population to adhere to a quarantine period, then day seven would present a whole better opportunity to get people out earlier and adhere to those first seven days, when they're critical, more than anything else.