When I wear my Wellington boots made by the Swedish bespoke shoemaker Janne Melkersson, the point of high boots become so obvious: its protective properties. You can walk around in the forest or wherever like a bulldozer, nothing disturbs you.
One really understand why many of the toughest military boots or work boots were and still are made calf or knee high. As most likely know, the original Wellington boots were not the rubber boots we associate the name with today, but this type of leather boot which was popularised by the 1st Duke of Wellington in the early 1800’s, which derived from the military riding boot Hessian. Sure, not the easiest to get in and out of, but when on the feet they are superbly utilitarian.