Because it is cross platform and isn't really used cross platform it is a pain in the arse. SQL Aliases don't work. So people have to put in registry hacks int

Because it is cross platform and isn't really used cross platform it is a pain in the arse. SQL Aliases don't work. So people have to put in registry hacks into C# code (YAY back to 2002). Loads of missing functionality (e.g. GeneratePassword is missing in aspnet core). It is just incomplete. .NET 1.0 was more together than ASP.NET core and that was in 2002. We've lost loads of functionality in the spurious benefit of it running on multiple platforms. I was developing ASP.NET on Linux 5 years ago. It is more churn and burn for the small amount of devs that use dotnet without Windows.