Except we have seen exactly this kind of play all over baseball.
As to Anderson specifically, he is really raw in terms of repetitions. He had less ABs in his entire college experience than Gordon Beckham had in his final year of college. He had 332 ABs total in all of college. He didn't play baseball at all until his junior year of high school. That is years of playing that Anderson didn't have to get those repetitions that lots of others player got.
While you can say he is 25 years old, and almost through his second full year of MLB service time, he is YEARS younger in terms of actual playing experience, especially that of a high level competition. Tim Anderson is quite literally learning on the job.