nlike the previous answers this is (I hope) a serious response. I may be wrong but I have long thought that a major factor in the failure of the Roman Empire, particularly as it became larger and needed mor central administration, was the sheer difficulty of book-keeping in Roman numerals. Even without a calculator it is (or used to be...) relatively easy to work out, say, 3 items per man per day x 4850 men x 156 days = 2269800 items required (and yes, I did use a calculator).
It is much more difficult to work out III x MMMMCCML x CLVI (I think) to get a result that I'm not even going to try to put into Ronan nuumerals!