I feel you are over-analyzing it. For me, all it comes down to is the order. So for the two categories you mentioned, blogs are usually ordered by the freshness of the content. You believe may be it should be ordered by the date they were posted. Search engines behave just the way you say even now.
Pagination would come next for overall user experience perspective. I am sure you agree with the perspective. The way I read your argument is around the ordering — sure it would be good to keep page numbers consistent for posts. However, it is only the writer who is aware of that. And even that might be a stretch.