Can you give your top factual reason (not opinion) why you chose not to use Material Design for your UI components? [on hold]

I work in a group that has decided to use Material Design (MD) to guide out UX design and I have to admit I am a complete convert. Material Design provides the base design language for our components and then we extend the components as and when we need to (documenting this in a design system and pattern library). It has made our design work much more consistent and means we are doing real design reuse (alongside our component based software reuse). There are good frameworks based on MD like angular for building our components which our developers can use.

My question now is what is stopping everyone doing this? I am trying to make this a specific factual question so that it falls within the rules. I am not looking for opinions here just facts as to why a particular group has chosen not to do this. So please just answer with your top factual reason IF and only if you have actually considered Material Design in your group/company/lab. I think it will really help me understand the scope of the Material Design space and what the limitations are.