Colorado has one of the best voting models the in the country with automatic registration, mailed ballots, mailed and early drop off. Thanks to the many secretaries of state that put these policies into place.
However, many people already submitted their votes prior to Pete Buttigieg and Amy Klobuchar dropping out. Those votes are now lost.
Ranked-Choice-Voting would make it possible that those votes wouldn't be lost due to an automatic run-off mechanism.