One of these things that technically true, but in reality people use it as a recency signal, and it's rumored to be a good signal for search engines too. So it

One of these things that technically true, but in reality people use it as a recency signal, and it's rumored to be a good signal for search engines too. So it still makes sense to keep it up to date. Even if it's just for making sure your deploy pipeline for an old project still works!