alt Hacker NewsThere are ecosystems that have package managers but also well developed first party packages.
In .NET you can cover a lot of use cases simply using Microsoft libraries and even a lot of OSS not directly a part of Microsoft org maintained by Microsoft employees.
2020 State of the Octoverse security report showed that .NET ecosystem has on average the lowest number of transitive dependencies. Big part of that is the breadth and depth of the BCL, standard libraries, and first party libraries.