Migrating from .NET Core to Angular may be necessary for a number of reasons:

Improved User Experience: Angular provides a modern and responsive user interface, which can be faster and more intuitive than traditional server-side rendered web applications.

Separation of Concerns: With Angular, you can separate your application logic into client-side and server-side components, which can make it easier to maintain and scale your application over time.

Better Performance: By using Angular, you can reduce the amount of data that needs to be sent between the client and server, which can result in faster page load times and better overall performance.

Cross-Platform Compatibility: Angular applications can run on a wide range of devices and platforms, including desktops, tablets, and smartphones, making it easier to reach a larger audience.

Industry Standard: Angular is a widely used and well-supported framework that is often used in enterprise-level applications, making it a standard choice for building modern web applications.

Overall, migrating from .NET Core to Angular can improve the user experience, simplify the application architecture, improve performance, and make it easier to scale and maintain your application over time.