Blazor...is not great at this. Currently, the packaging model does not do the justice to capabilities of .NET trimming because of the limitations of how the WAS

Blazor...is not great at this. Currently, the packaging model does not do the justice to capabilities of .NET trimming because of the limitations of how the WASM is currently packaged on top of Mono. If you want to see how well it can actually trim (which everyone seems to like calling tree-shaking, even though it's not exactly right), it is better to try out building regular applications with AOT - they produce small binaries. The experimental support in runtimelab for NativeAOT-LLVM targeting WASM provides much smaller bundle sizes and much better performance but given that it still is under dotnet/runtimelab rather than dotnet/runtime, I don't know when it will be available.