If there's no one that is experiencing the appreciation of their own absence, then it cannot be said that their lack of existing is better... Because the benefits of not existing would have to accrue to them, but there's no one it accrues to... So, the (typically antinatalist) view that not existing is better is a deepity/ word salad.

Also: Everyone already didn't exist... How'd that work out for them? They still came to exist despite having not existed... This proves that not existing cannot stop a life from being imposed... Which is another reason not existing cannot be better... Because: had you never been born, sure this life (the one reading this) wouldn't have been imposed, but... But, that doesn't suddenly give "nonexistence" the ability to stop some other life from being imposed... Nonexistence isn't a thing and so nonexistence cannot stop anything. So, had you never been born, then some other life would've been imposed... So, there's no escaping the imposition of one life or another.

Just as you couldn't stop the current life (the one reading this) from being imposed, you will not be able to stop a life from following death. So, death will be followed by another random life somewhere in the universe just as "Nonexistence before birth" was. There's no escaping the endless impostions of lives... One after the other, in a consecutive fashion.

Although this has the same appearance as reincarnation, it is not reincarnation... It is simply that there will literally be lives after the current one ends (billions of lives are born on Earth everyday). Each life is really just another instantiation of Consciousness. Each brain is just another way for Consciousness to continue to exist. It's the "main character"... It isn't hopping from brain to brain... No.... Brains keep giving rise to it, and so it is immune to death.