is there some practical benefit to running XP at this point?
None apart from the experience...nostalgia and fun. But, don't forget that XP is running on millions of old computers all around the world as we speak.
From the article,
"Windows XP is old, and Microsoft no longer provides official support for the venerable operating system. But despite the lack of support, Windows XP is still running on millions of computers worldwide. So why are people still using Windows XP? Mostly due to work, research, or entertainment."