Since this is the latest discourse, I’ll give my first hot take of the year (if you don’t count how the Warden and Blood Troll sets shouldn’t have been available to all races):
Elune has always had a partial association with the sun.
Ever since Vanilla, it was known Elune was related to Arcane, Life, and Light.
She was the source of Light for the Night Elves, she created the Wildkin with Life, and she is the source of Arcane for Druids. This was all established within Vanilla.
Between Cata and MoP we learn that Velen believes Elune has a connection to the Naaru. Through CDev we learn that this comment from Velen wouldn’t have been made unless he had a VERY good grasp on being accurate. During Legion, Khadgar believes the same thing. This theory is supported when the Tear of Elune reawakens Light’s Heart aka the Naaru Xe’ra.
Likewise, during Legion we see her incredibly powerful use of her domain of Arcane when she raised the fallen Ysera into the sky and manifested stars to form a new constellation.
This all goes to show that prior to Shadowlands, Elune was heavily tied to Light, Life, and Arcane. It’s also why people in the speculation sphere picked up on High Botanist Tel’arn saying how those three cosmic forces were the forces of Creation. This supported the previously established idea that Blizzard had been establishing through interviews and old lore sources that Elune would be one of the TRUE Deities in the WoW universe. The Goddess of Creation.
Even if we want to discount that original intent and simply go with the pivot that took place in Shadowlands, not much changes. Her being part of the Pantheon of Life would still involve her keeping these connections. Life would thus become her main domain, while Light/the Sun and Arcane/the Moon would both continue.
For Life to thrive, it will need Light which is a given. So it’s no surprise that Elune WOULD have some linkage to Light and the Sun.
TLDR: Elune has always had a partial Light/Sun theme and has always represented Balance. The balance/cycle of the Moon and Sun for Azeroth (which is why she’s an icon for Balance druids that use Lunar and Solar abilities).
In Night Elf mythology, Elune represents a single entity of both Moon and Sun.
In Tauren mythology, the Moon and Sun are represented by two separate entities: An’she and Mu’sha.
But hey, I’m just a Pandaren main, I don’t have much interest in either Night Elf or Tauren mythology.
I don’t care whether An’she is a real entity or not, but I’ve always said that he hasn’t yet been proven to exist. So either the Night Elves were half right and simply didn’t put enough emphasis on Elune’s solar theme, or the Tauren are right that An’she is real but is letting Elune fill his role while he’s seemingly on vacation.
My personal headcanon is that the Tauren and Night Elves are both half right.
Elune is 75% Arcane/Moon and 25% Light/Sun and An’she is 75% Light/Sun and 25% Arcane/Moon.
Originally they were a combined singular entity (Earthmother), and were split in two (when the Earthmother separated her eyes from her body).
I also headcanon that An’she created Niuzao and Chi-ji, while Elune created Xuen and Yu’lon. They were then fostered by Freya later on.
An’she may have created the Naaru, and Elune being her brother is why the Tear of Elune reawoke Xe’ra.
An’she is MIA because he’s been corrupted by Void from his injuries mentioned in the Folks and Fairytales book. We’ll rescue him eventually. Elune is gathering power and becoming an “Upstart Goddess” to rescue her brother.
Fingers crossed we eventually get our “oh mighty zodiark awaken from your slumber and descend” moment. Some Tauren Agent of the Void casts a spell and the Sun blackens in the Sky and that’s when we start “Mission: Save An’she”
Edit:
let’s also not forget that night elves have always had a racial tied to both night and day. Their druidic culture had also always revolved around balance of sun and moon.
Edit 2:
I do find it funny that this whole discourse is happening this week when it was essentially revealed during Shadowlands. Elune is the counterpart to the Winter Queen. The Winter Queen represents Winter and Fall, which means Elune represents Spring and Summer. Both of those are fairly solar leaning, and by her now being part of the Pantheon of Life/Nature that pushes her even further down the Solar route. It’s not a coincidence that these theme of hers has been getting more fleshed out since that point. The domain of Nature is obviously going to be feature a very solar and nature aesthetic, and thus it’s inevitable that Elune will have a color pallet akin to that of Eonar.
I’ve already figured out exactly how her Lunar theme would be explained.
The light of the Sun reflects off the Moon. Therefore, in order for Elune’s power to reach beyond the “Lifelands” (Meadowlands?) she must channel/shine her solar energy onto/through moons.
Thus, she was mistakenly attributed to a primarily lunar theme when it’s more accurately her secondary theme.
Keep in mind that stars (Night Elves = Children of the Stars) are suns.
Again though, this is entirely irrelevant of An’she.
You can have multiple entities with overlapping domains
Elune is Nature which involves the Sun and Moon,
An’she is simply the Holy Light.
Elune is mistakenly attributed fully to the Moon by her followers,
An’she is mistakenly attributed fully to the Sun by his followers.