EDF offers no providential advantage because God would not have the ability to change the future, even if He wanted to (Arminian simple foreknowledge). In Calvinism, EDF is because God determines and controls everything in advance, again, not the same as responsive, creative omnicompetence. Knowing possibilitites and having the ability to respond to any contingency is superior to omnicausality or simple foreknowledge without the ability to alter that foreknowledge.
You are making God subject to Foreknowledge, not the way it actually is.
God, in foreknowledge, ordains (allows to happen with appropriate response).
He IS the factor in what is foreknown, and as AMR has said, this makes what is foreknown foreordained. For these discussions, it is always very important that we look at what this means to us, and then again at what this means to God.
If one is a master, cannot be beaten, always wins; he knows every contingency or he cannot win with any surety, nor can he project that confidence truthfully-(as God does).
Foreknown is that He will be victorious. Not like the dead gunslinger or the Patriots.
God does not convey His actions to us as calculations or predictions or over-confidence. He doesn't come back to us and say "Well, I was mostly right."
When we read that all sickness, sadness, disease, strife, and the ilk will be wiped away, we don't have confidence like "The Patriots are going to win the Superbowl."
We have a confidence like no other. Nothing in this world is entirely dependable. We know even the sun will one day cease. Scientists predict the inevitable.
What we have in the promises of God are nothing like accurately predicting or the power of positive thinking. God doesn't win because He is not a quitter (although that is certainly a true understatement).
God wins because He is the best. Being Creator and sustainer of all things make His will certain. There is no freewill contingency that keeps these from happening.
If God is learning as OV says, He isn't learning anything but what is ultimately very trivial. In reality, if you understand this, freewill contingency really isn't contingent to God by any means. It wouldn't make a difference in His plans any more than an ant choosing a different path up the hill in Africa to me.
That being said, I don't believe OV correct here. It is only mentioned that what you are arguing for is insubstantial and not a good enough reason to become an Open Theist. On the otherhand, you, specifically, lose much appreciation for who God is by rejecting the truths preferred here.
God is not only capable (competent), He is the best and there is no better. In the freewill discussion, even if I were somehow wrong in my assessment, freewill isn't as big of a factor as you'd imagine to God, nor sufficient to deny EDF.
When God tells of Josiah existing 300 years later (by name) and what He will do. We have no indication when we read those events that God made it happen or it would not have. This is a bit precarious in reasoning because I already believe God has a hand in all we do and use it to argue against contingency.
Does Josiah lose freewill by doing as God says? I do not believe so. My wife has a favorite restaurant and so do I. Neither of us feel slighted when the other makes a reservation for us on special occassions. My will is not hindered upon in any way. I mean it is, but the problem with your thinking is that this should somehow be disturbing. It is not. I feel loved, cherished, and known.
For some reason, if I become 'unpredictable' or 'unknowable' this is supposed to give me personality, individuality, or make me somehow free?
If I ever grow tired of my love for seafood, I'll simply tell my wife and we'll go someplace else. I believe this too is not only predictable, but inevitable depending on how often we eat at these kinds of places (I'm not tired of seafood, we don't go nearly often enough).
I made a covenant with my wife "till death do us part."
Am I in bondage? Some people feel that way, but for me it is according to my desire and choice. I was made for marriage that lasts. Married, I am free to live as I was made.
As God knows every decision I will ever make, there is no constraint like you are applying here. I'm perfectly happy to be in His will and perfectly miserable when caught in sin.
Here is a question for you: When am I truly free then? When am I truly in bondage and have no freewill? What kind of freedom is meaningful here?