I would say Blazor is really very very good now. One of the most awesome things about it is that your skill with it transfers almost directly between a desktop app, web API, or web site. All the code is almost the same.
Blazor is just history repeating itself. This is Web Forms with a shiny coat of paint and the "magic" this time is WebAssembly and a different proprietary web interface that is undebuggable.
I've heard this "Microsoft has finally created a completely cross platform UI framework" like twenty times...
It is nothing like Web Forms (I've built dozens of Web Forms and Blazor apps so I know), and WASM is just one delivery vehicle for it. You can also render it server side or locally in-process in a full .net runtime (no WASM needed). The debuggability for the WASM runtime has improved alot as well since .net 7.
I've heard this "Microsoft has finally created a completely cross platform UI framework" like twenty times...