True; my question was, why ask others to pray for us given that the outcome is predestined.
That the outcome is predetermined is irrelevant as to whether it is a good idea to pray for others. We have the direct example of Jesus Himself praying for us (believers). He already knew the result, and yet He prayed anyway. We also have Paul:
1 Tim 2:1-2 : 1 I urge, then, first of all, that requests, prayers, intercession and thanksgiving be made for everyone— 2 for kings and all those in authority, that we may live peaceful and quiet lives in all godliness and holiness.
Prayer is good for both the pray-er and the pray-ee for reasons other than just getting the desired thing. Asking others for these prayers facilitates this, so it is good in the sight of God.
Very true. So that equally applies to prayers that involve saints, the initial controversy we discussed.