Attention to detail matters. Spending time looking at the code, and talking about (and explaining) your solutions matters.
If an engineer misses details and won't spend time looking for a more optimal solution on a white board, I wouldn't expect them to do it in the day-to-day work of their career either.
If an engineer misses details and won't spend time looking for a more optimal solution on a white board, I wouldn't expect them to do it in the day-to-day work of their career either.