My .NET experience is about 1 year out of date, but at the time the ecosystem was in a really great spot. First class Linux and Docker support, your choice of editor/IDE with VS, Rider, and VSCode, and nice test and profiling utilities.

Historically though (pre-.NET Core), .NET was always in a Microsoft bubble which held it back as the industry consolidated on Linux and Docker. The person you're replying to may agree that C# tooling is currently pretty good.