The difference is that Blazor is built on web standards (WebAssembly), not a proprietary technology. Sure, Microsoft could discontinue support for Blazor, but W

The difference is that Blazor is built on web standards (WebAssembly), not a proprietary technology. Sure, Microsoft could discontinue support for Blazor, but WebAssembly will keep running. C#/Blazor are not the only technologies using WebAssembly. I personally wouldn't use Blazor for a public facing website, and would only use it for an internal LOB app where I know I can dictate what browser technologies can be used, as well as knowing the binary blob for the runtime will be cached in most users' browsers. I still use traditional MVC structure with C# for applications that will have a variety of users over different connection types, and use progressive enhancement with JavaScript for things that enhance the user experience (for example, creating multiple items of some type on screen, instead of only being able to create one at a time like with a standard form). The thing is, I've already separated out my application logic so that I can change the front-end technology at any time. That really shouldn't have anything to do with Blazor, and is just a way to make sure your application can adapt to future front-end technologies.