I do it to disable things in the launcher that ships with my phone. In many versions of android you can't get rid of that dumb search bar wiget or that even worse experiences page if you swipe left from home. I don't ever use them, but they get in my way, it's my phone I want them gone.

As a side note I also dislike circle icons, but I dislike even more that they change the shape with every major release of android.