Dave, I can only guess it is partially a comfort thing, and maybe something to keep the techno-geek in some of us happy. It most definitely is not `needed`, and hopefully is not something people rely on, but use more for reference.
Though I don`t have a camera on my trailer, I am equally as guilty buying some other non-required techno-gadgets. We all are. How many smart phones, laptops, tablets, iEverthings, GSP`s, stereo gear, vehicle upgrades, fishing gear, beer (those last two were for baglo), etc, do most of us have a few of, things that we would and could survive well without?
2017 Escape 5.0 TA (someday soon, I hope
2015 Ford F150 Lariat 3.5L EcoBoost
2009 Escape 19 (previous)
“Most folks are about as happy as they make up their minds to be.” — Abraham Lincoln