Unified APIs may offer a shortcut to market for early-stage companies or those with limited integration needs, but as B2B SaaS companies scale, they often become constraints on growth due to issues such as custom field mapping limitations, lack of support for new and niche APIs, implementation gaps, passthrough requests, enterprise compliance roadblocks, and the surrender of control over their integration experience. An extensible integration platform can provide a solution by offering full control with less work, custom field mapping, complete API access, and enterprise-ready features that address compliance concerns. This approach allows companies to ship quickly while maintaining flexibility to support complex integrations as they scale.