the answer is that the Hindu Arabic munbers work by writing numbers
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Arabic numerals are simpler to work with mathematically.
IVI has no meaning in Roman Numerals. IV is 4 V is 5 VI is 6 IVI does not follow the rules of how Roman Numerals work.
Tradition and so as to disguise the year when the movie was made because most people can't work out Roman numerals.
The date can't be expressed in Roman Numerals since it's incompatible with that number system. You can possibly work out with only numbers, such as 2 or 11.
Wikipedia covers this topic extensively. I added a link below.