Details matter. So much effort is put into the design of a house, but gutters are often an afterthought, seen as a necessary evil. And yet, they are one of the most visible elements of a house! When we look at a house, the most prominent line is where the wall meets the roof. That edge is defined against the sky. It may be the most important line on the house. The quality of that line, and the continuity of that line, introduce us to the form and details of the house.
Since the roof edge is where we first understand the shape of the house, we should try to get that edge as perfect as possible, and think about how the eaves connect to the rakes.