FAQs with categories often annoy me. Maybe I've just had bad luck or I have a selective memory, but it just doesn't seem to work that well when I've used them. I understand that they're often necessary depending on the volume of content, but I very much prefer just reading down one simple page even if tends toward the long.

It's reasonably quick to scan, or use CTRL-f to look for keywords (without worrying that they might be on another page), and often times simple single-paged FAQs are written better and more cohesively.

Furthermore, even if I'm scanning over a question I wasn't specifically looking for, it answers other questions I might have, gives me a broader picture of whatever I'm trying to do, and informs me of subjects I hadn't even thought to consider.