I have heard this illustration many time before. I don't disagree that to have good balnce in life you need to be moving forward steadily. But it's misapplied in WT land. We need to be moving forward with lifes goals such as education, career and relationships.
Not as WT land puts it to move forward with spiritual rituals such as prayer, meetings, FS, study. All these rituals stop us moving on with our lives and create an unbalanced lifestyle.
Kate xx