Why does the soul not enjoy its final destiny immediately after her departure from the body?

St. Paul says, “Finally, there is laid up for me the crown of righteousness, which the Lord, the righteous Judge, will give to me on that Day, and not to me only, but also to all who have loved His appearing” (2 Tim. 4:8). He also says, “For we must all appear before the judgement seat of Christ, that each one may receive the things done in the body, according to what he has done, whether good or bad” (2 Cor. 5:10).