It’s simply a public affirmation of a mature commitment to Christ while reaffirming my baptismal vows and a way to be accepted into fellowship with the Episcopal Church. You are correct that strictly speaking it is not required to attend mass, receive communion, etc… But to be a full member and able to participate in mass beyond a regular congregant, etc… it is required. I decided that aspect of it is important to me going forward, particularly as I prepare to baptize my daughter later this year.
