If someone can’t see the forest for the trees, they get so caught up in small details that they fail to understand the bigger picture.
Meaning: If you can’t see the forest for the trees, one cannot see the whole situation clearly because one is looking too closely at small details, or because one is too closely involved.
For example: (from englishclub.com/ref/esl/Idioms)
- I don’t think we can see the forest for the trees at this stage, so let’s get an outsider to take a look at the project and give us a progress report.
- Mark is so focused on product details that he can’t see the forest for the trees when it comes to the overall needs of the company.
From an IT perspective the main weakness is that one cannot see the whole situation, or rather the system perspective and clearly understanding system dynamics to achieve real cost benefit and leverage (efficient and effectiveness)