Why does Moll Flanders preserve her alias even though her years as a criminal are far behind her? How does that choice contribute to the themes of the novel?

Moll admits to vanity and expresses arrogance frequently throughout the novel. These are ostensibly flaws, but how do these traits serve her? How do they hamper her? If she leverages these traits to her benefit, what does that suggest about whether they are flaws at all? About a society in which negative traits can yield positive results?

Why are none of the husbands or lovers regularly referred to by their names? Do these various men have specific characters? How might they be compared or contrasted to one another?