The perfection in the universe is according to its own conditions and goals
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327 The One who perfected everything He created and He began the creation of man from clay.
The perfection in Allah's creations, that is, the perfect design, is in terms of line with the reason and conditions for their creation.
Our world and our universe
1-The world of trials is aimed at its goal.
2-A mixed life, a mixture of paradise and hell.
3- It contains a finite life in which its creatures and even the universe itself will surely die in the end.
What is meant by perfection in this universe is perfection in terms of being suitable-serving for these 3 items.
That is, it has been designed and created perfectly in terms of serving the environment in which a person can be tested, serving to create the environment in which a person can experience pleasure or suffering on earth when necessary, and serving to come to an end after living for a certain period of time.
Because these are the goals of this world-universe-life. This universe is indeed "perfect" in serving the purpose and conditions of its creation.
But since the purpose and conditions of the creation of the hereafter universe are different, the perfection in the hereafter universe is completely different. This time, features such as being "immortal-eternal", constantly regenerating cells and not aging are perfection in the conditions and goals of that hereafter world. Because the purpose of creation includes these things and they are "perfectly" designed to serve this purpose.
(My Turkish article translated with machine)
https//emre1974tr.blogspot.com/2011/07/evrendeki-kusursuzluk-kendi-sart-ve.html
Peace