Seems like they're preparing a new part of Time Temple.

Eherm, had to step away for a sec! I really like this nightmare idea, it fits in really nicely.

Oh come on, you know what I mean... none of any of this makes any sense. The point I'm trying to make is WHY is the goddess' incredibly powerful mirror simply sitting at an altar, as you call it, and more importantly why the past? What about memory lane even signifies that it's in the past, other than the words "memory" and "regret" which are past tense. Nothing else, as far as I see it, signifies that memory lane is the door to the past. It's nothing like doom hene/ereve, and doesn't share anything about what went on in the past... You're not really going to disregard my point based on a technicality, are you?

As for your other thing, it's obviously able to be wielded by the dude that released Pink Bean, so it's not exclusive to the goddess. It's just a remnant of her power.

No, I don't know what you mean (honestly, I hate when people say that). I wouldn't be questioning your logic if I didn't understand it.
The Mirror of the Goddess is there because it's the Goddess' throne room. Pretty sure I said that.

As for that signifies that it's in the past, let's see:
"...because time goes backwards in Memory Lane, you can't go forward unless you are given permission."
Yeah. Probably because they pineappleing say so.

Oh, and I said only the Goddess can "properly" wield the mirror:
"What? The intruder touched the Mirror of the Goddess? Impossible! It's true that the Mirror of the Goddess has the power to move the past but only the Goddess herself can wield it! It's not possible for a mere mortal to #rmove time#k, I don't understand what they're trying to do! "

It's well established that he summoned Pink Bean on accident while trying to bring back the Black Mage.
The reason for this is that he couldn't use it... properly.
Yes, the full power of the mirror is exclusive to the Goddess.

hence the whole team rocket analogy. The head honcho (in that case) did all the work, while the bosses you fought only blurred the perception of what they're trying to do besides attack you.

Except Team Rocket regularly fails their mission while the Black Wings accomplished precisely what they set out to do.
The bosses served to distract from their true purpose. Mission Accomplished.

to other posts: I'm pretty sure we know where the Goddess is, as apparently we have the means to wake her up...so...we kind of NEED to know her location for that, or at least know that she doesn't exist in the Maple World.

WE don't.
Those entrusted with the Temple of Time's care do.