Isn't Yukari able to control the border between life and

>>15364965
For the same reason Rumia can't engulf the whole universe in darkness

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>>15364965
Yukari has a plan, and all of Gensoukyou's inhabitants, including herself, are merely pawns in it.

>>15365582
What's the next step in her master plan?

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>>15365590
Afternoon nap.

>>15365369
Because i put a coin in a shrine?

Yukari has four threads I think!

>>15364965
>It is believed because of that incident, youkai usually do not choose to attack outside their territory.
>The stories of this event are also what made her powers widely known among humans.

PMiSS kind of implies that she planned to lose the first war. Plus, considering her victory condition in the second war is "stole the Lunarian's rare sake", it's safe to say that she doesn't really care about winning.

>>15364965
By that logic Mokou should be able to take over the universe.

>>15364965
touhouwiki.net:
The moon is said to be a Pure Land similar to Higan where the impurity of LIFE and DEATH does not exist, and thus nothing can age or grow sick while on the moon.

So yeah, pissing off the watatsuki sisters is no different than fighting the Yama. In actual canon, the watatsuki sisters are stronger than yukari herself.