True, but it's much harder in some languages than others, and much much harder when crossing language boundaries. Copying a C# class to use as a DTO from a dat

True, but it's much harder in some languages than others, and much much harder when crossing language boundaries. Copying a C# class to use as a DTO from a database entity is way faster than trying to worry about serializing to a JSON structure while maintaining all the fidelity (like dates, big ints, binary data, etc). Another example is reusing business logic like validation for data input. Blazor lets you use a single layer of logic instead of using JS-based simple validation on the form and more detailed checks on the server.