That doesn't explain why standard C# had to deviate further from the script dialect just for import directives. These directives don't interfere with the rest of the grammar.

Is #:package <pkg> really so much nicer than #r "nuget: <pkg>" as to deserve deviating from .NET Interactive, F# and the existing NuGet picker? (It could be, if properly argued!) Has there been any effort to have the rest of .NET adopt this new syntax or share concerns?

On that note, is any language other than C# supported for `dotnet run`? Is the machinery at least documented for other MSBuild SDKs to use? Considering how dotnet watch keeps breaking for F#, I suspect not.