The sophisticated engineering works (or worked?) mostly fine if the piece of machinery is operated in the extremely narrow "just right" operating ranges the sop

The sophisticated engineering works (or worked?) mostly fine if the piece of machinery is operated in the extremely narrow "just right" operating ranges the sophisticated engineer defined. To much dust in the air? One too many potholes? Not the premium brand oil? There goes your sophisticated machinery. Times have changed and now the fuse replacement is not just a mater of over engineering, something someone put together thinking it's a technically perfect process. It became a revenue stream. Car designed also by accountants.