Why don't WK Lessons reinforce the reading usage in the vocabulary section?

I’m guessing the reasoning is that 時, a lower level kanji, is similar to 持 and both have the じ reading. Maybe they are trying to reinforce the fact that similar looking characters often have the same onyomi.

Here’s a script you may find useful: [Userscript] Keisei 形声 Semantic-Phonetic Composition