In most sales organizations I have worked for, they have required that a set of information is required before being able to save the customer in their CRM. As of now, HubSpot does not support this (according to themselves). My suggestion is that this is a feature that could be added so that sales staff do not save customers without important information being entered.
The major advantage is that sales managers will not have to promt sales staff to review all sales opportunities to ensure they have filled in the necessary information.