Hubspot - Bidirectional Synchronization is an essential feature.

If Dear supports only import or export features at a time, it does not quite make sense. In that case, there is no real benefit of using HubSpot or other CRM tools if the clients have to manage the deal status manually. 

CRM tools are used to communicate with existing and prospective customers, save all their details in one place, reach out to them via different modes of communication and do much more. As you may see, CRM tools are often used as the first point of contact with new customers. Inventory systems follow soon thereafter and we need bidirectional sync between both systems.