You try to do complex math with roman numerals....
Yeah, if they’d only used those numerals in inscriptions, it would have been a lot easier on them as they tottered on for over 1800 years.
https://www.google.com/search?q=roman+abacus
It’s not that tough. Just a different way of thinking of the numbers so we’re not used to it. But if you get comfortable enough with them that you’re not “translating” the numbers it works well. I’d rather do math in Roman numerals than octal or hex.