The Greeks had several competing numeral systems (https://en.wikipedia.org/wiki/Greek_numerals https://en.wikipedia.org/wiki/Greek_numerals) including a decimal

The Greeks had several competing numeral systems (https://en.wikipedia.org/wiki/Greek_numerals https://en.wikipedia.org/wiki/Greek_numerals) including a decimal based system. What I do not get is how come the Romans adopted (if they adopted from the Greeks) the most unwieldy one.