you're argument falls apart in one very important place.
We are the ones who acknowledge that it exists, and perceive it, we are conscious of it. Without us, the difference would be the same if there was a universe or no universe.
this relies on us being the only ones that acknowledge it exists, the only ones to percieve it, the only ones conscious of it.
tell me, what of the cheetah who mourns the death of her cubs? Can she, then, percieve, and be conscious, and acknowledge this death? I say yes. othweise, why would she mourn? This means that the cheetah can acknowledge, percieve and be conscious of existence.
What of the other possibly sentient species? How about those that can percieve of their own existence, and that the reflection of the mirror is actually them, and not someone else? Can they, suddenly, not acknowledge, not percieve, not be conscious of, existence?
How about life we don't know about. You can't rule out intelligent life in other parts of the universe. They too, could be capable of giving "meaning" to the universe.
In the end, this means that we are not the sole givers of existence to the universe, because apparently, it does matter to others.
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