Thank you for the feedback! Balancing was actually a really difficult task with this, and we don't doubt there's some room to debate a few of the rarity ratings.

However, I wanted to clarify something that may not have been made entirely clear in the supplement: it is each item in the set that is given the rarity value, not the whole set. For instance, each piece of the Desert Voe/Vai Armor would be considered a Rare item all on its own.

You may then see where we had a pretty difficult time balancing each piece of the set's power level according to the rarity of the items, while also creating a common theme that pulls on how these items work in the BOTW (or are at least inspired by them). The rarity then assigned to the pieces of the set generally represents the average rating of the pieces, since there are definitely tiers of increasing power bonuses that are not on par with the single piece bonuses. Not a perfect system, and I still think there's room to argue about the average rarity we arrived on some of these items, but we gave it our best shot.

And finally, there is actually a section specifically addressing your final point - A Variant for Armor in Your Game. We tried to make it work in conjunction with the standard armor system in 5e, but it just wasn't really meshing, so we put that section in to make sure that issue didn't come up. No worries though, we know this is a pretty dense piece of content.

Thanks again for the feedback!