When selling to enterprises, access control becomes increasingly important as the product grows and more complex structures are encountered. Role-based access control (RBAC) simplifies access control but eventually outgrows its limitations due to issues such as role explosion, maintenance complexity, and lack of flexibility. As a result, fine-grained authorization (FGA) models become necessary for scalable and secure access management. FGA offers precise control at a granular level, considering context like user roles, location, time of access, and data sensitivity, and can address diverse user needs, improve security and compliance, enable access control at scale, provide customizable access for external users, and become a key differentiator in the competitive landscape. However, building an FGA solution can be costly and requires careful consideration of scaling and performance management. WorkOS offers a fast, large-scale authorization service with a flexible system that can handle complex use cases and enforce authorization models across multiple environments.