The accusative is mostly difficult for native English speakers because we only use the accusative for certain pronouns (he/him, she/her, who/whom). It does take

The accusative is mostly difficult for native English speakers because we only use the accusative for certain pronouns (he/him, she/her, who/whom). It does take some getting used to if one has never learned the concept in one's native language. But denoting the accusative allows Esperanto to have an arbitrary word order, which cuts out a lot of headache elsewhere.