There is really no inherent reason to want to develop faster through the SD spiral, or move beyond an attachment to ideas in general and to the idea of I in particular, or include more of Other into I and us.
Yet, it is painful to experience the world through the filter of I and Other. It is painful to experience the split that comes from that filter, because it is not aligned with what is. So we are naturally motivated to move through the spiral, move up the levels, to allow what is to awaken to its own nature (of I everywhere and nowhere) while still functionally connected to this human self.
Since this motivation is as natural as anything else, we have developed a large number of strategies to either temporarily avoid the pain of the apparent split (entertainment, romance, sex, money, vacations, food) or to move towards a more radical solution (awakening to what is with no I inherent anywhere).
And if integrating projections is a big part of this process, then The Work may be one of the faster ways of nurturing development (along with more traditional approaches and other new ones such as the Big Mind process).