Why did hieroglyphic writing remain important during Greek and Roman rule in Egypt?

During the periods of Greek and Roman rule in Egypt, the knowledge of hieroglyphic writing became increasingly restricted to temples, where priests instructed their pupils in the script. Despite the availability of the more convenient Greek script, hieroglyphics remained significant primarily as a powerful symbol of pharaonic civilization.1

As Egypt faced foreign domination, national consciousness became deeply intertwined with religion, and the traditional hieroglyphic system served as an outward expression of that identity. While there were attempts to replace the cumbersome script with Greek, these efforts were largely ineffective due to the emotional and cultural value the ancient writing system held for the Egyptian people. Consequently, hieroglyphics persisted as a "sacred" tradition, representing "the god's words," until the rise of Christianity in the 2nd and 3rd centuries CE eventually led to the decline and final abandonment of both the ancient Egyptian religion and its associated script.123