Direct Answer
Justin’s description assumes a unified church life where leaders oversee who may receive, deacons serve the congregation, and traveling believers are recognized across congregations through accountability (“letters of communion”). For communion to function that way again, churches would need clearer standards for membership, baptism, discipline, and inter-church recognition—rather than a fragmented, independent approach.
Support from Transcript:
What would your church need to put in place to know who is “in good standing” without becoming legalistic? How might “letters of communion” challenge modern individualism and church-shopping?