I do not understand how you are incorporating free will into your argument, but I believe the general argument you are presenting is as follows:
1. If God had sufficient knowledge to create modern humans in the beginning, then he would have.
2. God did not create modern humans in the beginning.
C. Thus God lacked/lacks sufficient knowledge. (1,2 MT)
This is a very interesting argument, and the analogy of another creator may at first glance be appropriate since God as Creator is a common title which Christians cling to. It is true that in general, there would be absolutely no reason to implement a rudimentary design into a creation if the creator had the knowledge of a better or ultimately advanced version. This analogy holds true in your argument because you seem to be assuming that God values ultimately advanced beings (in science and technology as you state), where his ultimate purpose is technological advancement.
This is where I will object to the first premise, as I disagree with these assumptions. It seems clear throughout Scripture that God’s motivation for creation was not to develop the latest and greatest prototype of humanity, rather to develop creatures for the purpose of relationships, ultimately a relationship with him. Furthermore, since your argument entertains God as the creator of humans, it seems extremely unlikely that a God with the amount of power/knowledge to create humans does not have sufficient power/knowledge in any sort of capacity.
Your comment on learning also seems to provide evidence against the first premise, as the process of learning and advancement itself seems to be considered by most people, a joy in itself. Perhaps God places more value in humans learning than creating ultimately advanced beings.
Lastly, say I assume that in order for God to be a “sufficient” creator, He would have made modern technologically advanced humans. What about a slightly more technologically advanced humanity? Say almost 3 years more advanced, as I am responding to this post from 2017. Any more learned version of humanity would be the “modern” humans as you describe, and thus this argument seems to imply that for God to be a “sufficient” creator, he would have need to create beings that could no longer advance or learn.