We do receive them, actually, as Wu Heir explains when creating a new Art for Yuan Fang. That even before becoming a cultivator he could read a Art manuscript as whatever other book.
—Martial Skills. Vol-I. Library.
So, as you can see, even before the exposition Wu Heir already could simply read these symbols and understand them. That's why you can simply enter in the meditation menu in the Free-roam and select to learn a new Art.
And that is why Wu Heir Arts are so strong despite being "only" Top-Grade, as an MA art power is tied to BP and the level of comprehension in the said Art.
So even as a MA/before becoming a cultivator we were already enjoying of the immeasurable comprehensive talent aspect of COP, although as something born in the same Primordial Chaos as the Heavens the COP is way more than just that.