Well first you have to prove that the changes that took place was designed. There is no proof that says for example the Nene that I mention was "changed by a designer". None. Zippo... Nil...
We know genes can mutate from each generation. We know that in nature a small advantage can be the difference between survival and death. We know that the survivors are the ones who get to pass down their genes while the other do not. Over time it seems pretty logical that the changes that take place are going to be because of the environment, not because someone wants to make it happen that way.
Another point I want to make is if what you say is true, this designer of yours is trying to kill us by designing drug resistant bacteria. The bacteria that used to be cure by penicillin, like Staphylococcus aureus and Pneumococcus, now are resistant to it. Now why would a designer do a thing like that?
How much, at what rate?
That answer is critical for knowing if the theory is worth pursuing further.
We know that in nature a small advantage can be the difference between survival and death.
An advantage to one slightly mutated offspring born at t0, can randomly be a disadvantage to the exact twin brother born at t0+1 minte. A slight change in circumstance and nearly all such slight muttaional "advantages" are of no effect -- why? Because they are slight changes. So what is the rate of increase for that one mutant? We live in a world of only finite time. And the fossil record speaks of bursts of change and exceptionally long periods of sameness.
Sorry, this theoretical step has no bite.
We know that the survivors are the ones who get to pass down their genes while the other do not.
You are confusing survival with reproduction rate. Fruit flies and mice both have staggering reprodction rates and short lives. Long-lived survivors may be infertile. Please re-evaluate and re-express what you mean here.
Over time it seems pretty logical that the changes that take place are going to be because of the environment, not because someone wants to make it happen that way.
Sorry, so far your walk into the forest of logic has gotten a bit lost. Don't borrow so heavily from the "The Blind Watchmaker" nest time -- blindness is not a survival trait in wanders into the woods.
These are rational questions. The designer gave us His answers to these questions for you to know and understand
Genesis 3:21-23 22 And the LORD God said, "The man has now become like one of us, knowing good and evil. He must not be allowed to reach out his hand and take also from the tree of life and eat, and live forever."Was it part of the curse to keep man from living for ever? Or was it a blessing to make us have finite lives if we will live apart from God?