There were a great many myths regarding metabolism and various individual nutrients. But such is the objective reality of the cognition process. Scientists make hypotheses and try to confirm them, therefore at certain stages false confirmations are inevitable by design, as they say.
As for cholesterol, there is still no complete clarity and unambiguity of whether it is harmful. There is an understanding that, most likely, like any participant in the natural metabolism, cholesterol is not bad or good in itself. It has a complex of different effects (and, even more common, participation in effects initiated or mediated by other substances). At one time, there were studies showing that cholesterol itself has no declared biological activity, but is only a marker of the action of other substances.
One way or another, but the situation when cholesterol was declared to be the thing with which it was necessary to fight may well be called a myth. But this myth was part of another, larger myth - about the dangers of fat in general.
Now the harm of fats has been officially "replaced" with the harm of carbohydrates, but the trick is that we can't do without carbohydrates. We are carbohydrate addicts by nature.
In general, everything is fine in moderation, as usual ;-)
Well, personally, I don't know, I seriously say, well, as my father says to me - yes, it really is, well, I believe him, so my answer is yes and again yes
There is a whole movement - keto diets, low and no carbohydrate diets, assuming that most of your calories come from fat. Look at Sam Klebanov's website - lchf.ru. There are many translated articles explaining why eating more fats than proteins and carbohydrates, you lose weight and gain mental and physical well-being. There are translations of scientific articles, including some that show how the myth about the harmfulness of animal fats was born and where it led - the healthiest America demonstrates the most horrifying consequences of carbohydrate and low-fat diets. Our farmers give an answer why it is beneficial to maintain a conspiracy against proteins and fats (not wishing it, but stating the situation in agriculture): raising animals to get high-quality meat and fats is much more difficult and costly than plowing half the planet and sowing grain.
I myself have been following the principle of eating with the advantage of fats for the 4th month. The state of health is normal, the weight goes away - minus 7-8 kg. No fanaticism, but running. There is a friend who has been eating on this principle for a year now - minus 40 kg per year. There, on the website and in the VK group, there are many examples and explanations.
I don't know what you mean by the "great cholesterol myth", but in medicine, all information is constantly updated. At first, we didn't know about the importance of cholesterol at all. then we did not know about the significance of its various factions. Then we found out about it, but did not know about the details of metabolism. Then we found out the details, tomorrow we will find out something else. Science does not stop and does not rest on its laurels. Read Popper at last, all your questions are based on a misunderstanding of how scientific knowledge takes place.
Perhaps, competing large manufacturing firms, this pseudo-scientific nonsense is beneficial and useful, for example, in order to "impose sanctions" on the opponent's products, but I assure you that the effect of fatty foods on increasing cholesterol levels in the body, to put it mildly, is exaggerated many times over. In fact, our body is designed so that 80 - 90% of cholesterol is synthesized in the liver - regardless of whether you eat butter or tofu. That is, the diet, of course, can slightly adjust the level of this substance in the body, but it is completely insignificant - only by those very 10 - 20%.
I do not know how great this myth was, but I remember very well how many years in a row on TV they were spinning "eggs cannot be cholesterol there", "oil cannot be cholesterol there" and on the other hand there was information that cholesterol can cause and this, and the heart is bad, and blood clots in the vessels, etc. etc. Not every day, of course, but they played it. And people over 40 believed that eggs, butter, etc. - terrible poisons, from which he must die literally the day after tomorrow.
I can't say about the doctors, because This myth was supported by TV presenters and similar “authoritative experts.” As for scientists ... figuratively speaking, a ghost of a man in a white coat loomed over the TV presenter's shoulder, but who remembered what kind of ghosts they were? Maybe scientists, and maybe British scientists, or maybe some kind of impostors. It was not so important a question to check them for fake.