The main contention in industry is - It is not a viable alternative unless it has robust support for non-Windows based OS.
I can't wrestle with them but I don't have to. I am comfortable with Windows.
I've play a little bit with netcore but I still have the feeling that people are more for enterprise business and not so much packages. I like more the rails/django community :)
biased opinion :)
Look at AutoMapper for .Net
I find .NET Core to be much better than Django. EF Core is great and mature.
The admin interface isn't built in, but the C# ecosystem is huge, and you can easily find one that suits your needs.
When considering language usability, safety, ecosystem, stability, support, performance, and popularity together, I wouldn't use any other stack. I want to use F# or Rust, but I'm worried I won't be able to hire enough people who know them already.