There are some fine example or early woodwork that shows that the worker often left some surfaces rough, sometimes including rough from splitting. Even the better pieces were often brought to rough dimension with the least effort and refinement necessary and then the exposed or important reference surfaces were then brought to the best condition. Peter Follensbee has presented a lot of information on this in his work. Modern woodworkers often do s4s just because the equipment helps take the work out of the process and then we don’t have to worry as much about maintaining reference surfaces throughout the process. I think it is good to do the full traditional process on occasion jut to maintain the skills but I also admit to using machinery to reduce the physical work. It all depends on my mood, the project, and condition of the material when I get it.