The purpose of business specific weather alerts is to take shelter. They do not to send home people, out into the storm. So the question is stop production and take shelter, or continue production.
Back in the county wide tornado warning days, one could conceivably stop production under clear skies - for a threat 20 miles away. Polygons help quite a bit. While safety is always first, the Company may want to avoid unnecessary shut-downs. In some cases stopping and starting (cycling equipment) incurs large costs and/or causes extra wear/tear on equipment. In all cases production is lost. Nobody is ignoring warnings though.
Look at the flip side. Often private vendors, with well-trained meteorologists and/or CCMs, can get a business extra lead-time for the affirmative warning. The vendor only has to watch its clients, not the whole world, which helps with lead-time. While the article above focuses on the production question, I want to note private vendors often promote safety with early warnings.
Finally I strongly believe the public should heed the NWS polygon based warnings, period. NWS has the best of the best meteorologists. If a TV met suggests rotation before a warning, also heed that alert. Err on the side of safety.