Is there anywhere to benchmark the impact of semantic markup on SEO?

Question

Search Engine Optimization

Good evening.
What exactly will change if I forget about main, section, article, etc., do everything on divs? Or if I make a mistake in one place on the page, and stuff everything into an article instead of a section? Has anyone done comparison experiments? Maybe it's just myths, like the myth that "h1 has more weight than h6"?
After all, in fact, there are still many perfectly functioning sites that are still on html4 (some even on a tabular layout). And their owners do not complain about bad positions.
For example, a page on divs has the 23rd position in the search results, and the same page on the section \ main \ article - 9. That would be visual.
Thanks in advance.

Answer 1

there is no such thing, no one will post it in public, who knows; SEOs don’t know
getting under the penalty box with incorrect markup - a medical fact, but was it the only factor - xs
look like this - if the snippets turn out to be normal - Google understands the site, you don’t have to worry

Answer 2

Micro-markup is still a purely marketing feature (for example, to form an expanded snippet), which does not affect Google ranking in any way, but can affect Yandex (if the snippet is attractive).
As for the headlines. They have the same weight. It is important that they be on the page (preferably h1-h3).

Answer 3

you can
add additional semantics on divs via WAI-ARIA
https://habrahabr.ru/post/40730
example -
https://habrahabr.ru/post/320050
https://habrahabr.ru/post/322204

Answer 4

You can make a site on divs, and then fix everything with additional micro markup, highlight it. There, this thing is mostly needed to draw beautiful snippets. It feels like beautiful markup boosts SERPs. By how much - I did not measure exactly.

Answer 5

comparative experiments

and seo things are generally incompatible.
You can have two absolutely identical sites, but one will fly into the search, and the other will be somewhere in the ass, if at all.
And in general, I don’t care what kind of markup you have, the main thing is content.

Answer 6

It doesn’t matter what to type on (although, now it would probably be more correct to use sections, articles ...), the main thing is to correctly mark up the page to the maximum + unique content. Nobody canceled the headers, everything works, it's checked.