[Jochim]

Caching can often cause more issues than it solves.

While largely fixed now, older C# projects suffered from separating dll references from the reference to the package that provided them.

This lead to the situation where you may be referencing a package that hasn't been downloaded. Due to the package cache, the solution would typically build on a "dirty" environment like the developer's machine or anything that had previously built the project but would fail on any fresh environment.