That being the case, an obvious question surfaces. The righteous are written and sealed immediately for life, the evil are written and sealed immediately for death, while the others are 'hanging' in abeyance from Rosh HaShanah to Yom Kippur. Tosefos explains that the reference of the wicked to death and of the righteous to life refers to life in the World to Come. The Maharsha clarifies the meaning of these words.
Every person does right and wrong.
Those who are righteous have their reward awaiting them in another life, while the wicked are rewarded here, but denied the blessing of the World to Come. Righteous and evil are terms referring to judgement which is G-d's alone. We neither know the true thoughts and actions of a person, nor their true reward and punishment. It is only the righteous and evil whose fate is sealed immediately. Rav Chaim Shmulevitz elucidates the full impact of this concept.