Tefillin and philosophical outlook

Greetings and blessings,
First of all, I would like to point out that I am putting on tefillin and the goal is not to argue about Chazal, but only to share a thought (so to speak heretical) and to put my mind at ease. I am sure that each of you has asked or will ask yourself the same questions and thoughts in the future, and it is excellent to share it with you. I have read the books of the revolution and the scientific proofs (so to speak) about it and what Chinese medicine (which I personally greatly appreciate) says about the points where we tie the tefillin of the hand and head.
The very act of putting on tefillin is not natural at all?? Why in the first place process the skins of animals that were slaughtered/died naturally and turn it into a black box with 4 parshiot? (Because God commanded it)
In fact, He commanded, "…and you shall bind them as a sign on your hand, and they shall be as frontlets between your eyes" or "and you shall bind them as a sign on your hand, and they shall be as a memorial between your eyes, that the law of the Lord may be in your mouth, for with a strong hand the Lord brought you out of Egypt."
After all, the whole purpose of the tefillin is to remember the Exodus from Egypt every day, and there are many other spiritual and physical reasons for this, but the main thing is to remember the Exodus from Egypt. Chazal also said that a person would never sell his house and buy shoes for his feet. While today almost everyone knows that it is healthier to walk barefoot because that is how everyone does it in nature [in Jamaica, the city of the best runners, they walk barefoot on the beach, and so on throughout the world that is disconnected from technology and the pursuit of money, lust, and honor]. (Perhaps because of the snakes – "You will smite his head and he will smite his heel") But this is just another example of something that we use animal skin to create, and it is completely unnecessary and does harm.
"The work of man's hands is wasted." A belt simply presses on the stomach and digestive system (especially those who do not know how to wear and purchase a suitable belt) and creates problems. Leather is processed with chromium, which is a toxic metal that subsequently pollutes the environment, in addition to the person who purchases the product and the person who prepares it. Even during the time of the Gemara, anyone who worked in a tannery (a leather processing workshop) was said to be cursed. Because the work was extremely smelly, they would make sure that the tannery was not in the direction of the wind (east or west, I don't remember) so that the smell would not leak into the city.
At first it sounds very bizarre. Why not tie something living? Kabbalah from Moses from Sinai. (I find it hard to believe, I admit). Let's tie something natural that is made from plants and it will work out scientifically and from a Chinese medicine perspective and everything. The whole thing about messing with skins sounds completely absurd to me in general, so I'm sharing it. There are things that we seem to have invented and we really wouldn't need if we lived close to nature and didn't distance ourselves from it like we did when we lived in the Roman, Greek, Persian, and all those other kingdoms. King Solomon in the Song of Songs shows us how close he was to nature and King David in the Psalms. It's impossible that they were far from nature and managed to write with such wisdom and detail.
It is possible that they simply wanted to find a use for the leather and attached the leather (which really preserves the parchment well) to tefillin, shoes, clothing, etc., when all of these are completely unnecessary.

Why not tie banana peels? Or green plants? Because you need black paint. And a cube shape. To be honest, it sounds crazy to me and I would be happy if someone gave me a good answer.
Not answers that I already know, but something smarter. I know that we believe in the words of Chazal, but I would love to hear an explanation from Rishonim or Aharonim or any other explanation. Thank you very much.