There is another rather important point all the naysayers seem to be missing.
The ORDER of the colors on the crystal. They didn't have to be lined up exactly like the pride flag (and yes they are in the EXACT order. Not even reversed with violet on top). In fact, there were two BETTER ways to do it if we wanted to make a less conventional rainbow in-keeping with in-game lore:
Elemental wheel: violet-red-amber-cyan-blue-green (or some rotation of that)
Order restored (which I think should be the stronger argument): blue-amber-violet-red/green-cyan.
The fact that the game takes neither of these approaches certainly weakens the argument that it is *just* elemental crystal.
ALSO in this particular rainbow, we have a pretty significant band of yellow that doesn't correspond to any of the elements. So the design quite literally is pulling from more than just the six elements as defined by the game.
This is really poor literary analysis, frankly. Nothing in Matoya's cave or the story surrounding it creates a context where a rainbow might mean something else.
The Eden raids craft two stories in parallel that both contextualize the crystal:
1) The restoration of the empty.
2) The development of Gaia and Ryne's relationship (friendship, romance, whatever it is).
Both are built up over time, and in particular the latter is absolutely at the forefront of contextualizing everything in that story arc. The rainbow crystal at the end pretty much acts as a stamp at the end of the story signaling completion. The fact that it is at the end of a same-sex relationship seems pretty on the nose to me as to what the devs were intending, and it proves to be very elegant writing.
There are many stages and forms of romance and many ways to tell that story. I never said they were deeply in love. So please continue to mischaracterize me just like you are the entire Eden raid.
Also, what is it with you people and lacking legibility? Capitalization and punctuation, please.