Did We Need Less-Perfect Minds, and That is Why We Came to Earth?

I venture this thought, not knowing if it is true, and not saying it is.
But wondering.
If life on earth places us in an imperfect body, one that degenerates, what becomes of the thoughts now within the mind of such an imperfect body?
Do they become less perfect? Do we remember things less? Is our ability to think impeded?
A child sits in the womb of the mother for nine months, about. And, when it is born, it is not able to speak. This is a time when all things can be forgotten. In the womb, it is introduced to its body. All the thoughts and memories of pre-earth life are perhaps brought into the little brain of the little pre-born child.
It  would seem a mortal body might have its degenerative elements right from the time the pre-born begins to develop in the womb of the mother. And, that might mean the memories begin to degenerate as the degenerative elements of the mortal body -- mortal mind -- how are the housing elements for those thoughts and memories.
Is this how we come to forget the heavens, and our pre-mortal existence? Our mortal minds cannot remember things as our spirits, alone, did? The spirit's mind was not of decaying flesh, and was not held back by the conditions of mortality. Did we remember things better, as spirits? Did we reason more clearly? Did we hold more things in our minds without letting them go?
With mortality, comes a mortal mind, it would seem.
Is this one of the reasons we were sent to earth -- because in order to have tests, we needed less perfect minds? In heaven, it would be harder to reject the truth, because our minds would reason more clearly, and be less able to deny the truth. The truth would sit right in front of them, unable to be escaped.
Thus, a mortal mind would be more subject to being tempted.
I don't know that what I have said is true. I wonder, but do not know. I pray that it is okay to wonder about such things, to consider on them, to think about them. I pray that such things are not off-limits. I hope and pray it is okay to wonder about them.