It's about time to add Coil story mode, isn't it ?

[Eidolon]

While I do agree with your point, it could also be argued that if the primals have these "easy mode" versions that are easy to beat and teach us nothing of the extreme version, why can't Coil have the same thing? Just for story purposes.

You're unfortunately comparing two slightly different concepts. The story of the Normal/Hard Mode Primals is chronologically before the story of the Extreme mode primals. They're not meant to fill the same purpose, because in terms of story, they fufill different purposes.

What you're suggesting is that current raid content would be a Hard Mode, and that it would have its own story, while the version your suggesting would be a first clear 'normal' mode, and wouldn't share the same story we currently have.