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funcantor

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I think its because it's sort of gone in the opposite way that science usually goes. Science traditionally been the process of physical phenomena that we don't understand => falsifiable theory that helps describe that phenomena.

Meanwhile, we started at stuff like the perceptron. The starting point was that we knew everything about that equation/classifier. Now we have a thing that we built from the ground up, and we don't fully grasp how it all comes together.

I guess very roughly you can say that if you describe a system with some set of parameters, which when changed in particular ways leave the system's quantities (energy, momentum, etc..) unchanged then you have a connection between symmetry and conserved quantities.

I would agree with this, good explanations and rigour are definitely not mutually exclusive. But I am not sure what you are expecting. This is a research paper, intended to be read by other experts. Even still, if we look at how the paper is organised, the authors start with a high level overview, and build upon simpler problems to leverage their way to an understanding of the main result. For a research paper, it is extremely thorough.

If you want a 'simple explanation' that allows a layman to gain some understand the problem, sure. But this isn't, and absolutely should not be, the purpose or content of the research publication, which is to succinctly communicate to other experts the results of their findings.

Its a research paper, the audience is going to be other experts in the field; it will be written in a way suitable for publishing to a journal. Even with a concise writing style, the paper is already at 100 pages. If you want to understand the paper it would make more sense to pick up a textbook and learn about the prerequisite material rather then expecting them to write a book for you, just to communicate their research result.

And too add to this, dietary intake of cholesterol in general has less of an effect on serum cholesterol levels then people realise. This is especially true for eggs iirc due to the how the cholesterol is found within them.