I'm put in mind of several things.

Robert Heinlein is known to have written, "Specialization is for insects."

An old adage says, "The devil is in the details."

I tend to think of it as, "getting lost in the weeds.", which means to get too far off the beaten path to make useful progress.

The opposite of this is expressed by the statement, "Don't Try to Boil the Ocean", which means to try to do too much all at once.

Ideally, it would behoove an individual to be mindful of both the microcosm and the macrocosm within the parameters of the overall goal.

When it comes to getting work accomplished, micromanagement can be as stifling as uninvolved, inattentive management of time and focus is unproductive, the end being a lack of positive result.

The best place to find a tree is in a forest, but try not to cut them all down at once.