So Luz’s meeting with Dad-Titan in the finale actually really nicely explained WHY there needed to be the whole time-loop with Luz being the one to teach Phillip/Belos how to use glyphs.

It affirms/reinforces the idea that Belos was always nothing but a fraud who never had any true understanding of the power he was using. Because it’s clear he COULDN’T figure out glyphs on his own and never would have without help. At the end of the day, ALL the knowledge and power Belos had was either given by others or stolen from them.

Instead, it was ALWAYS Luz who figured out how glyphs worked. SHE was the one who actually connected with the Titan. Luz was always the one to understand the magic she was using.