Sure. But it still takes some time until the interactive part works. And it doesn't solve connectivity issues a SPA can easily handle.
Blazor Server: On a broken/poor connection there is no interactivity anymore
Blazor WASM (=SPA): Keeps working when connection is lost, but everything is sooo slow
classic SPA: Keeps working with lost connection and is fast.
Why should it be slow? Once Blazor WASM is loaded, it doesn't need a connection to the server anymore.