Mainly Because of the divergence of variants, some distinctive morphemes aren't found in Regular Chinese. Characters rarely used in Standard Chinese have also been made or inherited from archaic literary requirements to characterize these distinctive morphemes. By way of example, characters like 冇 and 係 are actively used in Cantonese https://share.evernote.com/note/d9b88e7c-dab5-66b5-af7a-01e7a6300095