And yet, all Microsoft's demos for the upcoming changes for Blazor in .NET 8 (like SSR) has been a public facing recipe site (e.g. https://www.youtube.com/watch?v=QD2-DwuOfKM). I'd say this is a very similar use case as the Microsoft Store.

I love .NET and ASP.NET Core, but I use it purely for backend. And even there, I use 3rd party libraries like Fast Endpoints (https://fast-endpoints.com/). Microsoft keeps bringing in new technologies and effectively abandoning the ones that fall out of favour (look at the progression from MVC -> Razor Pages -> Blazor). I do not blame the Microsoft Store team for not trusting the .NET team to not simply abandon Blazor as well somewhere down the line and instead opt for other technologies for the front-end.