The limitation of the convention system used to nominate political party candidates was that only one candidate could be nominated in the convention system. This restriction meant that there was limited choice for party members and voters.
Additionally, very few leaders were nominated through the convention system compared to the caucus system of nominating. This could result in a lack of diversity in candidate selection and potentially limit the representation of different factions or viewpoints within a political party.
Furthermore, convention delegates were rarely chosen by a vote of the party's local members. This lack of direct involvement from the party's local members in selecting delegates could lead to a disconnect between the party leadership and its base, potentially undermining the democratic principles of representation within the political party.