Many thanks to Fizzlemizz and Lombra for comments, and sorry for the late reply.
So, here are some of my stances.
1. At this stage, I am not really planning to release this UI to public as I am aware of myself that I am not a skilled addon developer, yet. I would be honored if someone decides to use it as teaching materials, but don't think people will learn a lot from my work
2. Like Lombra said, most of the end users (especially those with less knowledge on Lua) would prefer the least amount of folders as it would seem complex on their perspective. However, as I've stated on my point 3, I personally think that such structure would make it easier for those users to disable a module (e.g. Unitframe) that they don't like and instead switch it to whatever they prefer just like we do with default UIs.