El Dorado in space

Dunno, but I like the reference. But if we can pool together everything that comes in sevens, and/or is colored golden, we'd get a whole trail mix.

Giving the writers too much credit. 7 is just a nice number

Also number 7 is commonly used across myths, legends and religions. It's a pretty common and important number across human cultures worldwide.

This is where they are dividing in universe and out of universe marketing...well at least in part.  In universe the AI is just a scientific endeavor, out of universe the player knows the Reapers are a threat so...whether we want to or not...we are fighting for a new home.  

Though also in universe, probably because of events in the game, the AI will end up having to fight for a new home because they can't get contact with the Milky Way like they wanted and because things went wrong on the other side so they have to fight for a new home, both the environment, and the various hostile groups in the area. 

it about referring to the goldilocks zone since they only thought they could be garden worlds because they were roughly in the right places but they didn't know tell we get there and while thing happen.

Eletania is a garden world, but still has a hostile environment to non-native life. 

Garden Worlds can still be hostile. The Initiative's PR markets the Golden Worlds as the coolest of the cool, so of course they're going to come up with a fancier term.

With any luck.  We'll probably get something more along the lines of a standard white savior plotline.  I'm always hoping for something a lot more politically incorrect.