I stopped using those things when I was a kid just because they were not practical for a "seasoned" pioneer who kept meticulous records of his service to God. Not enough room to jot down all relevant data, including my astute observations, keen insights, and discerning spiritual perceptions.
The s-8 was okay for beginners and the spiritually inferior. I required a small 3-ring notebook, properly tabulated according to territory zones, with plenty of refill paper, as my ministry, like Jehovah's chariot, was always on the move and advancing forward in dynamic fashion.