Please try it. It certainly is interesting. And it has been around for a while which is a good sign.
Again, I tried „Vaadin Flow“ (conceptually similar to C# Blazor) and it is fun. I built a productive solution with it (wo pro) that is integrated with Spring Boot.
40k/year sounds premium. But what little do I know, I am German and pay about 3k/year for a very nice Kindergarten.