In a large enterprise, the IT department is evaluating two integration approaches for connecting their Customer Relationship Management (CRM) system with their Enterprise Resource Planning (ERP) system. The first approach is a point-to-point integration, where a direct connection is established between the CRM and ERP systems. The second approach involves using middleware, which acts as an intermediary to facilitate communication between the two systems. Considering factors such as scalability, maintenance, and flexibility, which integration approach would be more advantageous for the enterprise in the long term?