I'm confused. When I don't want to see the details of the topic branches, I run 'git log --first-parent'. Why not make it easier to see what I want to see, but

I'm confused. When I don't want to see the details of the topic branches, I run 'git log --first-parent'. Why not make it easier to see what I want to see, but then let me drill down and see more, instead of removing the details all together?