The process where you get more and more burrowed into the details of a thing or a subject.

It is generally not a positive thing. You get to be so specialized in something that you lose the whole point of things. A good way to say it would be that you are unable to see the forest for the trees.

If you practice detailization you might come to the realization that you have gone too far into the details and have lost any meaningful understanding of the thing or the subject.