There the argument is between boots and trail shoes. As I pointed out last week, some people say that you need heavy stiff boots to protect your feet and ankles while other say that heavy stiff boots are actually dangerous since they interfere so much with your natural gait.
Martin's excellent blog had an interesting post on this recently. Make sure you read the comments - there are some fascinating insights.
Built to run, Built to walk
So run with a friend carrying a tent between you and all your kit one weekend in Inov-8 310s and wildcamp on the route and say you’re training for a mountain marathon and no one on the hills will bat an eyelid. Do the same route walking in the same kit and call it backpacking and you’ve crossed some unknown safety line and are using the wrong footwear. You’re risking twisting a ankle, breaking a leg. “You’re just wrong”