That isn't how I understood it. It isn't that no one requires salvation, it's that everyone gets salvation, Universal Salvation.
Traditional Universalists did believe in a limited hell, actually...dealing with the problem of injustice unpunished and the logical issue that Trey mentions by allowing for purgatory.
What offended the original Universalists was the Christian doctrine of
eternal punishment. Hosea Ballou made an excellent case that having an eternal punishment for a finite crime or transgression is inherently unjust, and does not befit a God of justice. He did allow for a period of
limited punishment in an afterlife, before the eventual salvation of all souls.
For myself, historically speaking, I'm probably a "trinitarian universalist", e.g., I don't mind seeing different aspects of the one god illuminated by the aspects of father, son, and holy spirit, or by the thousands of other names and aspects attributed to the infinite. And, I think the idea that certain people are condemned eternally and others are not, at the hands of a divine being, is monstrous.
In any case, as a religious humanist, I wish we could rename our Faith. Both of our names refer to 18th-century religious controversies that don't have much traction in today's thought. It's an awkward name to say and write, besides. The contraction "UU" isn't that appealing either.
Fact is, Unitarians and Universalists "glued themselves together" in 1961 for organizational convenience and never did the theological work to truly create something new out of their separate histories. We glossed over our differences and celebrated our similarities. Now, we've become something else altogether, as our placement in the "syncretic" part of RF denotes. I hope that the name "Unitarian Universalism" will be exchanged for something else someday, though I have no idea what that might be.