Same with Blazor. The mon.wasm runtime is around 400kb compressed and the biggest DLL is mscorlib at 600kb. The actual DLLs for the app are just a few kb.
Yes you can be smaller with JS but not by much these days, and given the amount of functionality you get with Blazor it's hard to compare on file size alone. Also if you're just making internal apps with controlled usage then server-side is better anyway.
Here's a very old build: https://blazor-demo.github.io/
And a recent build: https://stevesandersonms.github.io/BlazorOnGitHubPages/
Yes you can be smaller with JS but not by much these days, and given the amount of functionality you get with Blazor it's hard to compare on file size alone. Also if you're just making internal apps with controlled usage then server-side is better anyway.