Pagination is a challenge for pages listing answers and/or comments because multiple answers/comments can belong to the same question. The first page can merge the top (say) 50 Q, A and Cs using qa_any_sort_and_dedupe(...) to list each question only once, connected to its most recent post. But there's no easy way to display the subsequent pages of that same list via an efficient database query, without a more complex database schema. I'm sure opinions will differ on this but it doesn't seem like a valuable tradeoff to me.
One exception I made is for the list of answers by a specific user (coming in Q2A 1.6), because generally users only answer each question once.
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