I think that rushing to canonize someone smacks of subjectivity. That subjectivity may affect the investigation of those miracles that are attributed to a proposed saint.
True. I believe that the Church requires 50 years after death before canonization, and it was waived for John Paul II and John XXIII. Pope Francis even dropped the 2-miracle requirement for John.
The time period is to offer a proper historical perspective before acting in a matter of importance. The impetuous canonization of John Paul (the fastest in the history of the church) was aided by the cries of his mourners at his funeral demanding immediate sainthood. I admire John Paul, but this rushed canonization results too much from emotion. Time is needed for proper perspective.
As for John, I admire him too, but never thought of him as a saint. His great-nephew was a roommate of mine in law school. My rowas a very nice guy, but no saint.

I don't claim that these men aren't necessarily saints, and frankly canonization is a human designation, but I don't see the need to dispense with or lower the standards and requirements to rush someone in.