I don't believe that to necessarily be true. If you take a regional approach to your product's offering along with any branding/marketing that goes along with that then you risk backing yourself into a corner. What you can end up with is a product that is so specific and focused towards a particular region that it then becomes a huge undertaking to adapt it in order for it to be suitable for other markets.
Whereas is you take a "global first" approach to your product creation then it becomes seemless when you end up transitioning across to other markets, which allows you to have a far stronger and more consistent brand identity. That way it's less work in the long run and your product ends up being more robust. If you want a prime example of this look into the thinking behind the design philosophies and branding that went into the iPhone.
That's just my take on it.
I think it is safe to say that most of Europe/rest of the world has no interest in the X1. There were different times over the last few years where MS were practically giving the console away and they couldn't really move the needle. The US and UK markets have been much more receptive to the console. It is important at the very least for MS to close the gap in the US market moving forward the rest of the generation. It is a tough hurdle as the Pro will always have the price advantage moving forward over the Scorpio which is something that MS will have to sell in a large volume in order to turn the tides. That is not to say that MS should not focus on the rest of the world but at this juncture they probably need to consolidate their efforts into a few markets where they can succeed.