Why was How do you configure a Windows machine for a Linux user? closed as too broad?
I can see that it might appear broad. It is broad. But there's a distinction between broad and too broad — broad questions are fine. In what way is this question too broad?
The question has two comprehensive answers that cover all the essential points (disclaimer: I wrote one of them). That refutes the assertion that there “good answers would be too long for this format”. As for “too many possible answers”, I don't see it: it does require a fair amount of effort to get a good answer¹. (Of course I can imagine any number of bad answers, but that goes for every question.)
So why was this question judged too broad?
If this question is indeed too broad, how could it be re-scoped to cover at least the two top-voted answers?
¹ Unfortunately, say I, as the target audience of that question.