User blog comment:Anon3610/Fairy Forms - Their True Purpose/@comment-2056915-20170805065738/@comment-29197449-20170807024345

Honestly, Harmonix should also count as a pointless transformation. While it's supposed to be a prerequisite to Sirenix, we've already witnessed the existence of incomplete Fairy Forms, which are basically Fairy Forms that have been acquired outside of the normal process and have become harder to control for the fairy who triggered it as a result. The most famous case is Bloom's incomplete Enchantix that she got through sheer force of will. It was said many times over that she'd risk having her powers damage her own body because they were too unstable for her; she wasn't ready for the sudden rush of Enchantix-level powers because she didn't trigger her Enchantix in the conventional way and there was no way for her to do so. However, she finally completes it by Secret of the Lost Kingdom through putting her life in danger to save her parents and her kingdom.

Now back to Harmonix. It's just a prerequisite to Sirenix, but why couldn't the Winx just have been given an incomplete Sirenix? It would've given them a glimpse as to what would be in store for them, the month-long time limit would make more sense because having an ancient and incomplete Fairy Form would make battling much more of a risk as their powers would be unstable and they could be rewarded with a complete Sirenix with access to the Infinite Ocean upon completing the Sirenix Quest. Harmonix and Sirenix are way too similar and as much as I like Harmonix visually, it seemed like much more of a hassle to have for obvious design reasons. Plus, having incomplete Sirenix at the start of the season could help flesh out the transformation and give the Winx more spells (especially because they wouldn't be able to risk using powerful spells due to their unstable powers).