Depends on your goals. If your goal is to effect a long-term attack on an organization, then yes, you want to introduce systemic issues that will fester.

But the Simple Sabotage Field Manual was developed in and for wartime. It was meant to provide information to dissenters and occupied peoples on how to surreptitiously affect the war effort. The time scale is far different. You needed the factories and bureaucracies to slow down as soon as possible, not have a slow decline over the years.