Youmu:

> "If someone more magically-inclined wants to try it, I won't stop you. But I'm not doing it again until twilight. I already massively screwed up once today by not following instructions, I'm not doing it a second time."

Myon:

> Tilt our head the other way, a little further, in mild confusion.
> If we can do so, walk along the pond floor toward the turtle to get a better look at the bottle and its label. If we can't, float toward the turtle instead to get a better look at the bottle and its label.

> "Guess you have a point... Alright, up to you since you found it." Marisa states.

> You approach in inspection, though the turtle moves back a bit.
> As you investigate it more, you speculate that the label might actually be a seal. This is one of those things to capture phantoms... But it's small, and why does a turtle of all things have it just lying about in it's shell?
>_

Youmu:

> "If someone more magically-inclined wants to try it, I won't stop you. But I'm not doing it again until twilight. I already massively screwed up once today by not following instructions, I'm not doing it a second time."

Myon:

> Tilt our head the other way, a little further, in mild confusion.
> If we can do so, walk along the pond floor toward the turtle to get a better look at the bottle and its label. If we can't, float toward the turtle instead to get a better look at the bottle and its label.

Youmu:

> "Even though it says to open in twilight?"

Myon:

> Adopt a thinking expression, then light up with an idea.
> Gesture to the turtle with both hands, indicating it.
> Then bring both hands back all the way back to our torso, as though holding something to our body. If we can get our hands a bit inside our body, all the better.
> Then point upward, to hopefully indicate the surface.
> Then hold one hand flat, palm-up, in front of us, and use two fingers on our other hands to 'walk' across it.
> Finally, given the turtle an expectant look, tilting our head slightly to the side.

Pretty much. That's how we got lootboxes in the latest games

That and unrealistic fantasies, like Okuu's nuclear fusion reactor. Basically anything that falls into obscurity, y'know, beyond the "border of common sense". And thing is, line between than and modern/relevant stuff is pretty fragile. An old mobile phone and (in retconned CoLA chapter) a handheld console are mentioned as objects that fell into Gensokyo. I feel that's what Yukari means in that "cruel, cruel thing" quote.

So that means, if something was the cutting edge of technology in the past (for example: PlayStation 3 in 2006) that's now seen as an old thing of the past, it will then disappear from the real world and be in Gensokyo, more specifically; in Muenzuka and/or the Road of Reconsideration. Am I getting what you're saying?