What is the benefit of الاستخارة if all of God's decrees for the believer are good, and does this mean that my answer regarding the benefit of الاستخارة is incorrect?

Istikhara, like supplication (Du'a), can avert divine decree (Qada') and دفع بلاء, and it is beneficial for what has occurred and what has not yet occurred. It is part of divine preordainment (Qadar), through which a person flees from God's decree to God's decree, utilizing it as a means, relying on God, keen on what benefits them, and entrusting their affairs to Him.