I know there is a background process that bumps unanswered questions to home page; I understand the logic behind this is to give them a chance to be answered.
The problem is, this often bumps to home page old and useless questions, which are often no longer relevant at all (or could not be answered in the first place because they didn't make a lot of sense).
Discerning how much sense a question makes or how relevant it is can't easily be automated; but shouldn't this process at least avoid bumping to home page, say, more than X-years-old questions? An additional criterion could be the number of upvotes they have (which is often zero).
Addendum: this has also the unfortunate side effect of new and clueless users trying to answer ages-old meaningless questions; which needless to say tends to have... pretty bad results.