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Some guesses:
Google will try to visit "important" pages often and keep them fresh in their database. A page is considered "important" by Google, if it fulfills a combination of demands. Some of those demands might be:
1. It has incoming links from "important" pages.
2. It is doing well in SERPs for competitive search terms.
3. It is updated often.
4. It is situated on a website that generally is updated often and gets many new pages.
This is more or less what Google have been doing for a long time. But I believe that they are trying to differentiate the treatment of pages to a much higher degree. And one of the consequences may very well be that "unimportant" pages on large websites are crawled more seldom.
But I'm only guessing.
had almost 100 backlinks, now only shows 11
Google's backlinks facility is totally unreliable at the moment, showing backlinks that are not counted and not showing links that are counted.
With the old update cycle every site got crawled deep, now the most resources are given to the highest PR sites IMHO.