I know it may sound weird, because how can you realize Buddha through dropping desire to realize it?………..Now, I can give a quote from Longchenpa: "Sought-after truth is found by not seeking it."
There is also the "gradualist" approach, where effort is made by sutra or tantra. Longchenpa is talking about the short-cut. Not everybody can find the short-cut, otherwise that would be the only path ever taught to anyone.
Yes, indeed it looks like this. Beside the fact that this short-cut is hard to find, it seems to be available only to specific type of recipients. I, for example, feel deep affinity with this "sudden" approach. What is important, is the fact that this "superiority", in my eyes, in not achieved just by less time needed do succeed, but rather, the very nature of sudden techniques. They take the present moment, and create the mind shift now, or during next few hours.
There are those who drive joy from running Marathon race, but also those who drive it from a single acrobatic act.