Each had their own community, strengths, weaknesses, and doctrinal focuses as is the landsacpe we see today.
We see that within the Catholic Church, though, too - different parishes and different dioceses of the Catholic Church have different strengths and weaknesses,
too. We don’t have to seek outside the Catholic Church to find modern-day Laodiceans, or Ephesians, or Smyrnians, etc.
There was a sense of unity within the Christian community even though there were often vigerous disagreements between the Apostles in the direction of the movement.
Again, though, that’s not much different than the state of affairs in the Catholic Church today - different Bishops have different ideas about what’s important, and how to solve our current problems - that’s why we have Councils, and that’s why they wrangle on for years and years until they finally reach an agreement - just like the First Council at Jerusalem, which is recorded in Acts 15.
Back to sacraments. When the disciples took communion with Christ, their state of knowledge, understanding and faith was incomplete. On this, I believe there is no disagreement. If we put aside the semantics of transubstantiation (sp), the argument for non-catholics not being offered communion is their faith and/or understanding is incomplete.
No, that’s not the reason that non-Catholics are denied Holy Communion. The reason they are denied Holy Communion is that they are not in full communion with the Church - it has nothing to do with how much they understand, or what they believe.
Even if a Protestant or other non-Catholic had a perfect understanding of the Eucharist (and having been there, I know this from personal experience) they would
still be denied Holy Communion, until such time as they completed the process of Initiation into the Church. It’s not one’s level of knowledge or what one believes that determines worthiness to receive; rather, it is, first of all, being in full communion (membership) with the Church, second, being in the state of grace, and third, being properly disposed to receive at the time that it is offered.
A certain measure of belief and understanding is, of course, assumed, and people can’t come into full communion with the Church if they don’t at
least understand that they are to believe what the Church teaches - and hopefully, they have examined Church teachings and understand it, but that part is actually less important than assent to the authority of the Church, even if they don’t have a perfect understanding of it.