.NET Core does support both WinForms and WPF, but only on Windows (with no plans for other OS). Maybe that's what you meant and I just misunderstood? Regardless

.NET Core does support both WinForms and WPF, but only on Windows (with no plans for other OS). Maybe that's what you meant and I just misunderstood? Regardlessly it used to be the case that .NET Core didn't support those GUI frameworks even on Windows, so it's a bit confusing.