Box three has become my favorite to play! It's the center of the pinwheel of the minor shape, and if placed at the root note on the sixth string, it's a suspended scale, which is cool because it means that even if the parts underneath you are major or minor, you still won't miss a note!
I thought I'm a rhythm guitarist. I don't need to work on that. Or "I have a cool voice. I will just get someone else to play that hard parts." I didn't have a good voice at the time, so I don't know why I thought that would work, and honestly, it's a pretty piss-poor excuse to not get better at something I loved. ESPECIALLY WHEN IT'S SO EASY TO LEARN!