I recall learning at one point the idea to effect: Death is the key imperfection in human existence
What are the sources under this?
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Death was not supposed to exist at all, until Adam and Chava ate from the tree.
This is parallel to the Jews not supposed to exist after Mattan Tora until the golden caff.
Meam Loez (Genesis I) Meam Loez (Genesis II)
In this context the population was never supposed to be eight billion, Mashiach was not even part of the plan. How do we know this, following logic, If Adam was supposed to live infinitely, then too his kids, the population would be around the tens of millions, the amount of space on earth, the only reason we are able to keep populating is because spots keep opening every 75 years or so, and at times sooner.
Another opinion would be, no, just two, Adam and Chava because we all lived through them.
Why was mashiach not involved in the first place, simple, if man never sinned, then there would be no reason for a savior, they would be living like robots until the time runs up for the planet.
Unfortunately in our time, this is not the case, so we have to deal with death, and disappointment.
I would highly recommend to invest in the meam loez series, it will answer ninety-nine percent of your questions and even share with you some insight on parts of the Tora that's not mainstream. Everyone approves of the author and its contents.