Part of the problem is that nutrition is incredibly nuanced and unknown, but people want simple, absolute answers.
Different people have much different bodies: they react to foods differently, have different metabolisms (at least based on sex/age/height/weight/bodyfat/exercise), and different preferences. Bodies are also complex, and there are 500 different causes that can all lead to you feeling like garbage.
But that wouldn't sell papers, there wouldn't be much to write. So people make blunt statements. Most of what I see online seems to be geared towards the "average American". Which ironically means, the people reading these articles who actually care about their nutrition, most of it doesn't even apply to them.
And this isn't even getting into another factor, which is that people get particularly defensive about nutrition. So others take these blunt, over-generalized statements as fact and double down on them. I see this in-person by people who are otherwise really smart.
Examples: "eat less salt and more fiber" - you don't know how much salt / fiber I'm eating. "Almonds keep you full" - idk some people eat loads of almonds. "Keto changed my life / I hate keto" - that's your anecdote, it only applies to you.
Specifically, for eggs: if someone has high cholesterol, it will show up on bloodwork, and if the eggs raise their cholesterol, cutting / reintroducing them will show up too. If I eat 6 eggs a day and have great cholesterol, some study that says on average people who eat eggs die of a heart attack, that means nothing to me. If I eat 6 eggs a day and have terrible cholesterol, and after I stop eating eggs my cholesterol lowers, some study that says eggs usually don't spike cholesterol, that also means nothing.