As I've said before. I rather a dedicated keypad. Lots of people do. While my reason is for texting when driving - a very bad thing - the point is I can glance at my phone and reply to either messages or whole emails using a BB versus an iPhone or Android. I have to pull off the road to do that. I can say that having used the three platforms and various devices.
Knowing the solution doesn't mean knowing the method. Yet answering correctly and regurgitation are considered "learning" and "knowledge".