If your SaaS doesn't expose APIs, you're basically building a walled garden in 2025. No webhooks, no REST endpoints, no GraphQL = zero automation potential. Users want to pipe your data into their workflows, trigger actions from CI/CD, or build custom integrations. Without programmatic access, you're forcing manual clicks for everything, which kills adoption among devs and power users. Modern stack expects everything to be scriptable. Lock down your UI all you want for security, but if there's no API layer, you're competing with one hand tied behind your back.