That's a pretty bad reaction, and also highlights the absence of good cross platform development in your studio, because of lack of common tools. You should release your games for Linux for a change.

But this also highlights, that pragmatic value of cross platform tools is apparent when they are really cross platform. I.e. the wider is their availability, the higher is their value. OpenGL didn't quite reach that, because of opposition from lock-in minded companies. So this is a welcome change in Nintendo's approach, because it advances Vulkan as a cross platform API.