[akra]

Most of those package issues also apply to C# particularly as it stabilizes towards .NET 5. However it isn't too bad once you get it; and for most standard use cases it seems to work with the dotnet cli out of the box. Many people seem to be productive with C# so I'm not sure how big of an issue it is other than the small initial learning curve but many package managers have that (IMO Maven is harder yet many people use that in Java space and not too hard once you learn it).

REPL's often have problems with package management in a number of languages as they often have a different build chain from the compiled style apps which have the chance to resolve packages. When doing .NET Core in the past I know Paket can generate these scripts for the REPL to import packages (seen csx/fsx scripts for each package) - but another comment alludes to a more supported way in the future which is good.

Doesn't seem like you have a problem with the language per se; rather the package management story for .NET Core.