Modern applications need to evolve with changing user needs and preferences, and Descope offers a solution by allowing A/B testing of authentication and user journey flows without altering the application's codebase. Through examples such as piloting passkeys, implementing geo-aware authentication methods, progressive profiling, and adaptive multi-factor authentication (MFA), the platform demonstrates how these tests can enhance user conversion rates and personalize user experiences. These strategies include testing passkeys to improve login success rates, offering region-specific authentication methods like WhatsApp in India, and using risk signals to adapt MFA requirements. The article emphasizes the flexibility of Descope's workflow approach, which enables companies to visualize, audit, and modify registration and authentication processes seamlessly, ultimately improving user engagement and reducing friction in the login process.