In the play our town why do you think wilder uses the stage manager as an intrusive prologue/chorus? what does he add to the play?

What he added to the play is that the one everyone knows and says "hello" to on the street. When Thornton Wilder created Our Town, he experimented in the way he presented the characters and action of the play. Perhaps the biggest departure from a traditional play is the role Wilder created for the Stage Manager.