CssBuilder

Tied exclusively to ASP.NET Razor Components, making it irrelevant for other web frameworks like React, Vue, or traditional ASP.NET MVC, which limits its adoption outside the Blazor ecosystem.

For components with static or minimal conditional classes, the builder pattern adds unnecessary code complexity compared to inline conditionals or simple string concatenation, as seen in the basic problem example.

Introduces an external library dependency for CSS string building, which might conflict with projects aiming for minimal dependencies or those using alternative styling approaches like CSS modules.