I’m gonna get philosophical here, despite being a pantheist, not a Christian. Consume at your own risk.
I remember a children’s book I had on the theme of, “everything changes. Nothing stays the same.” I think we as humans struggle with this our whole lives. If something’s good the way it is, why can’t it just stay that way forever? We like it and we don’t want it to go away!
But we live in four dimensions, not just three. The most beautiful still-shot in the world is less engaging than a feature film, and a movie has to consist of more than a still-shot, no matter how beautiful.
The old gives way to the new, again and again and again. Without death, if every living thing was immortal, we’d either have to have a lot fewer babies or get a lot more crowded, pretty quickly.
But just because there’s not enough room in the present for everything that’s ever lived, and just because we’re stuck going one speed and direction through time, doesn’t mean that the past is gone or unreal. It’s just not available to us. Is just not being able to get there ourselves and watch dinosaurs running around really a cause for sorrow? Well, from a personal perspective, sure. (Unless you’re happy not to be dinosaur fodder yourself, of course.) But from a greater perspective of the whole?
Why would God create anything impermanent? Because change and growth require an impermanent world, or they can’t operate. Permanence is static, unchanging by definition.
My two cents, have at them!