John, as weird as it seems, the Billboard charts have never been as accurate, as they are now. That is why you see those Christmas songs pop up, they are actually getting airplay and selling copies! In previous years, they were ineligible to chart more than once, unless officially re-released.

Overall, you are correct, the Billboard name lost relevance years ago due to technological advancement, if not competition.

The charts overall, also indicate the trouble that Top40 or Contemporary radio overall, faces. When you have songs lingering for 52+ weeks or for example, The Weeknd "Blinding Lights" rank for 90 weeks in the Hot100 and 52+ weeks in the Top 10, it indicates the illness. It also indicates lack of good product and adult numbers driving the format.

Z