From my standpoint, two reasons: 1) He didn't need it; and most importantly, 2) the Bible says nothing about it.
As Isaiah quoted God, “My thoughts are not your thoughts.”
Great quote. Apropos of it, when satan was trying to tempt God, the former said: "Prove you're God by changing these stones into bread". The Latter could have said, "Who needs stones? I can make bread out of bread, or I can make bread out of nothing." Instead He said, "It is written...", and insisted that the higher priority is the Word of God -- which, again, says nothing about evolution (or the changing of rocks into people).
Thanks for the thought-provoking post.
The Bible doesn’t say anything about DNA either, but there it is. A lot of things are not in the Bible. The Bible says the essential point: God caused it to happen. Everything else doesn’t matter. And everyone who gets in a dither over evolution, I think are wasting their time. Worse than that they destroy faith by getting young people to pit their faith against needless straw men. By not letting the question to be rightly open we put the young in the position of not accepting science without losing their faith.