Why the Heart Sutra?

Christians have, at times, touted the Lord's Prayer as the "perfect" prayer; it contains evidently all the stuff that monotheists want in a prayer.

The Heart Sutra, in my view, is substantially more profound than the Lord's Prayer, and, at the same time, is not a prayer.  It's more-or-less a sutra.

"Sutra" as Wikipedia helpfully explains, is a Sanskrit word that means string or thread; yes, it is equivalent to the English word "suture," which is what surgeons put in you when they stitch you up after surgery.  Yeah, humanity is that close that a sring or thread in Sanskrit is a string or thread for surgery in English.   Did I mention that the words "Zen" and "thank" also have a common origin?

The Lord's Prayer is a prayer directed to the Christian deity written in the second person. The Heart Sutra on the other hand, is said to be the words of the Buddha to his disciple Sariputra; thus, it is not meant to be addressed to anyone,  rather, it is the quote of the Buddha taken as a statement of fact.

The main point of the short sutra - with is the main point of the "wisdom" sutras in general - is that experiential phenomena - our apprehensions of the five "aggregates" of  form, feeling, volition, conciousness have no inherent essence; thus all is but a temporary co-existence of these aggregates.

This statement of fact by the Buddha includes that when the Bodhisattva of Compassion deeply saw the reality of the emptiness of the five aggregates that they obtained complete awakening. 

How can this be, or why is this so?