Dotnet core (now just dotnet) was a full rebuild of the framework specifically for cross platform support so they could get more enterprise cloud hosting on azure, running everything on Linux

Modern C# is built for first class Linux support for everything except UI

Even if you don’t have a special setup, having a section telling you that is still a helpful thing to quickly assess a new project.

I appreciate knowing that a project should Just Work with minimal setup so I don’t have to guess or make assumptions

The argument for having tabs adjust depending on your ide sounds better than it is in practice. Someone formatting code to look nice with width 4 will look horrendous for someone who uses width 8.

Spaces makes it uniform and captures the exact style the original dev intended