<p>(This is SE-wide, not just here.  That is, the ideal place for this question would be meta.SE.)  </p>

<p>That said, I think the list of questions on the main page is just the display of a <a href="https://en.wikipedia.org/wiki/FIFO_(computing_and_electronics)" rel="nofollow noreferrer">FIFO data structure</a> composed of the questions most recently asked, edited, or answered.  The most recently changed is pushed in to the top, and the 31st / 51st(?) is popped from the bottom.  </p>

<p>So far as I know, that has always been the way it worked, and I'm aware of no plans to change it in the future.  </p>
