But still, I agree to your points, but you still have to ask the question: how did he not notice the fence?

It’s a common human error to make a wrong assocation:
“Sat-nav works when I’m driving.”
instead of “Sat-nav works in this case because the city roads are well-travelled and it behooves the company which produced the product to ensure that it would work on the roads – though it may require extra care and dilligence on my part to ensure for my own safety when I drive on less-travelled paths.”

Not only that, but, come on. If I paid for a product, I want it to work as advertised. With the advent of marketing and public relations companies, you could be buying a seriously shite product because they have conveniently omitted details or failed to rigorously document the proper use of a product.

Sorry to put the daisy in your gun barrel, so to speak… but, the motivational poster? “Retards: every now and then, everybody is one”