It’s been decades since I spent my days seeking out solutions to productivity problems for roofing contractors. My job was selling equipment to roofing contractors, but my success came from simply showing up and talking about (and providing) solutions to whatever got in the way of a more productive and profitable roofing job.
Not only am I out of that business, but the business as it was then has also moved on. For example, the company I worked for from the mid-1970s to the mid-1980s used to ship asphalt kettles in by the rail car. I doubt that the equivalent of one railcar of new kettles has been sold in this country over the past decade.