BOB DANCER STRATEGY CARDS

I do not understand why Bob's cards have four levels.  If you want to play his strategy 100% there should not be a difference.  It isn't like you can control what comes next.  I have a few other questions but will wait for an answer on this one.  thanks

Simplicity vs accuracy. Each level getting increasingly more complicated but more accurate as well. You give up a little EV for a simpler strategy. That is explained in his strategy cards. 

Thanks, I kept reading that but it just didn't make sense to me.