It's a lot better with some notable exceptions. First, .NET Core is multiplatform by design, so it is by default quite portable. The .NET Core CLI is extremely powerful and means a CLI workflow is totally feasible (and also simplifies CI pipelines). The new "multiplatform" application framework, MAUI, runs on Windows, Mac, iOS, and Android, but not Linux/GTK/QT etc. You can maybe attribute this to the design philosophy of abstracting native controls, of which "Linux" itself has none, but either way it's useless on Linux. Third party frameworks like Avalonia do work very well on Linux.