if RCIA “works” right, you should not “miss the fellowship”, because part of the process happens outside class, it is becoming integrated into the life and mission of your parish. In my former parish in Ohio, they were a little thin on doctrine, great on the gospel, but totally outstanding in involvement. Our RCIA “grads” consistently became involved parishioners and in many cases leaders. One is still running the Appalachia outreach 10 years later, one leads the volunteer coordination project, some still in small faith sharing groups, parish council, catechists, and many other ministries, including those for Catholic Charities & community.
That parish has a strong adult education ministry, in part (in my opinion) because RCIA grads are hungry for more truth and doctrine, and see that they get it.