Remembering the Primary Phonemes

I started this course recently. Can anyone explain its practicality? I think it may be useful, but any assurance that I am not going on a wild goose chase would be welcome.

I have already studied the Hiragana & Katakana and have a good start with over 500 Kanji meanings in the ‘Speed…’ deck but have yet to delve into onyomi & kanyomi.

I noticed every visible (to me) person who has taken the course dropped it after a brief stint. This deck has been based on the ‘Remembering the Kanji 2’ volume.

What I think the phonemes will teach would be to place onyomi and kunyomi in parity with meaning of radicals. However, I have had second thoughts and have decided to consult the Japanese studies community hereat.

Thanks for reading.