That's quite a rant, but it seems like it's from experience with the old times. For the last decade or so it's been a completely different story.

System.Text.Json is part of the core standard library, the only reason to use Newtonsoft is developing on legacy applications.

Visual Studio isn't necessary or even much recommended any more. VSCode or any LSP editor works fine.

You don't need to install nuget, any more than you need to install cargo in rust, it's part of the SDK. You can also just edit the csproj in the same way you could edit your TOML file. It's XML, and you just add <PackageReference="" />.

You can compile --self-contained to be able to run it somewhere without the runtime installed.

.NET has a long history, but almost none of these are actual points of friction in the current year.