An iPaaS offers prebuilt connectors and a visual builder, so common integrations can be set up faster than writing custom code. It suits well-supported systems and straightforward flows, such as creating a customer in the ERP when a deal closes in the CRM.
For example, an operations team might use an iPaaS to sync new hires from the HR system into Microsoft 365 and the ticketing tool. The limits appear with complex logic, high volumes or unusual systems. Usage-based pricing can become expensive at scale, and critical business logic spread across dozens of visual flows can be hard to test, document and hand over, so some integrations are better built as code.