Currently, if you use the SE search the results contain both, questions and answers by default. The result of that is that the search results contain many duplicates, which I find rather annoying.
You can work around that by using
is:question as a search parameter, but that is not an ideal solution and also not very obvious to new users.
The ideal default would be in my opinion to search both questions and answers for the search terms, but to combine the results so that each question appears only once. Each result would represent the question and all its answers, so each result would be more like a page, not a single post.
If you would specify
is:answer or any other question/answer-specific search option, it would revert to the current one post per result display.