Potato Question

The other day I made my grandmother's recipe for German potato salad for the first time. The recipe calls for baby red potatoes, boiled, cooled, then peeled and sliced. I'm curious what difference this makes in the end result vs peeling before boiling. (The rest of the recipe involves making the 'dressing', which is then poured over and folded into the potatoes, and then goes into a 200 degree oven for an hour) submitted by /u/mrmadchef