I say uncentral because, other than the dogmatic requirement to believe it, it has no impact whatsoever on our salvation. Christ and the Apostles taught many things, that we must have faith, we must be charitable, we must do good works, we must help those in need, etc. etc., to be saved, but they never said we must believe in the Assumption, the authority of anybody (aside from Christ), or in anything else for that matter. This sounds very Sola Scriptura, but to clarify it is the farthest thing from what I mean.
I will use the Scriptures here as an example, not because it is the be-all and end-all of faith as it is not. Throughout Paul’s letters, he tells us many things we must do to be saved. He also tells us several things that he thinks we should do, but we don’t have to (like remaining single for instance). To me (even though I believe in it), the Assumption is one of these things. Whether we believe in the Assumption doesn’t have any effect on our reception of the Sacraments, for instance. Neither Baptism, nor Confirmation, nor Reconciliation, nor the Holy Eucharist, nor the Annointing of the Sick (the Sacraments which collectively ensure our salvation) require us to believe in the Assumption (the Eucharist does but only because of the requirement to believe dogma; it in and of itself does not require it).
In other words, if not for the Church’s own statement that we must believe the Assumption, it would have no bearing whatsoever on our salvation. Therefore, why do they require it so? I see nothing wrong with defending the truth of the Assumption, and of insisting it as a doctrinal certainty. However, when it comes to requiring belief in it for salvation, a wholly disconnected act (for US PERSONALLY, clearly it was connected to Mary’s salvation!), I do not make the connection.