Why do films and TV series use roman numerals to date the production date?

According to David Feldman's book Imponderables: The Solution to the Mysteries of Everyday Life:
Why are copyrighted dates on movies and television shows written in Roman numerals?

The general consensus is the "deception theory":
to "make it difficult for viewers to determine exactly how old the show is", the reason being the older the date the "staler" the material may seem to the audience.

Then there's the "inertia theory":
That's just the way it's always been done.

"The general consensus is the "deception theory" - to "make it difficult for viewers to determine exactly how old the show is," the reason being the older the date the "staler" the material may seem to the audience. Filmmakers don't like that, it seems. (In my humble opinion, though, a good story is timeless.) Then there's the "inertia theory": That's just the way it's always been done.

https://newsblaze.com/entertainment/features/why-are-copyrighted-dates-on-movies-and-tv-shows-written-in-roman-numerals_27910/