We’ve had huge issues with suppliers not going to Mold Tech. It’s all fun and games until someone screws up your tool.
VDI specs are an issue if there are any downstream changes that need to happen. Since VDI is done on the EDM when burning the tool, if you need to modify an area later it creates a of issues with getting things lined up correctly, whereas with the process that most MT textures use, you can modify the tool and texture it when finished.