What is a potential drawback of heavy reliance on Outbound Messaging?

The potential drawback of heavy reliance on Outbound Messaging is primarily related to the possibility of message delivery failures during outages. Outbound Messaging operates by sending messages asynchronously to an external endpoint when a specific event occurs. If there are network issues, downtime on the receiving end, or Salesforce itself experiences outages, there is a strong chance that messages may not be delivered successfully. This can lead to data inconsistencies and operational disruptions, as important event information may be lost or not processed as intended.

In scenarios where timely data transfer is critical, relying solely on Outbound Messaging could introduce significant risks, especially in environments with high availability requirements. Alternatives or supplementary methods, like APIs or other messaging services with built-in retry mechanisms, should be considered to mitigate this risk.

The other options touch on valid concerns related to integration strategies but do not capture the primary risk inherent in Outbound Messaging itself as distinctly as message delivery failures do.