and I don't understand what's wrong with that.
It's like saying "There are so many different operating systems for so many different types of hardware that the computer market is too fragmented - so we won't produce any software"
It's silly. If you want those users then you make the software, if you don't then you don't. simple.
BTW, I'm in the throws of switching to Vista after being an Ubuntu user for many years. They don't like my bugs but Microsoft actually seems to care.