I went through a phase where I wanted to define known subjects with as little line as possible - seeking to use negative space or blank space to define shape and features as much as using hatching or stippling does.
With the creation of the fine tip Sharpie pen - I now had a tool that allowed me to work fast and created hard - bold lines.
What I've always loved about pen and ink illustration is the level of commitment you must have when you start a new work. You can't second-guess yourself or you'll make a line that you can't undo or take away.
It's also fun because when those moments come it forces you to rethink your composition and either take it a new direction or force you to start over. Either way it's an opportunity to learn and to expand your skills and your expressive language.