Net 9.0 LINQ Performance Improvements

Anyone knows of a comprehensive book/tutorial to learn end to end web development in dotnet. Most I have found are elementary, outdated or poor quality.

That is because all the hot-and-new in .NET web development is Blazor, and it is not really popular outside of Microsoft's Blogosphere (and IMHO never will be and go down the same way as Silverlight did). The "venerable" technologies are still present in .NET 9 and still work, get maintained etc.

Doing web dev in .NET nowadays for me is mostly creating HTTP/JSON/REST APIs and using whatever FE framework you like to interface it (for me that is React or NextJS). The keyword you want to search for is "ASP.NET WebApi" or - more modern - "ASP.NET minimal API".

You could still do .NET MVC server-side rendering using "Razor" (the markup language in ASP.NET MVC - search for "ASP.NET MVC Razor".

Why is this still a problem within the dotnet world? Why aren't there a dozen popular application frameworks to choose from like there is for Java and most other languages?

In dotnet, it seems everyone uses the Microsoft "blessed" framework, until Microsoft does a full rewrite or loses interest - then everyone has to rewrite their stuff too.

There's no way Microsoft are the only ones capable of producing good library/framework ideas - so what gives?