That could be true but I think that very few people really have that talent. Most people have only one or two good ideas and those come from observing something in a domain that they are in. That's why pg gives the advice to work on something you know about because no doubt he has observed the relative success rate of people who work on things inside and outside of their domains. I think there may be a few people who do have the talent to find problems outside of their immediate domain but I also think that like any 'talent' its probably something you could learn and develop by observing those people, how they think, what they do etc.

True and finding a very important makes it more special.