I think the reason this was created was to see if the Monaco editor (the one OneDrive and Azure use to edit files - it's great BTW) in the browser could be put

I think the reason this was created was to see if the Monaco editor (the one OneDrive and Azure use to edit files - it's great BTW) in the browser could be put to use to create a general purpose IDE. Also, stripping down Visual Studio to be cross-platform isn't an easy task. 1. It's WPF and hence depends on Windows only components. 2. It's a lot of C# which covers some assemblies not provided by .NET Core yet. 3. The codebase itself is over 20 years old at this point.