Maybe I should just leave it alone?
Right now the stairs and decks are smooth and nice. Weathered though, which is fine with me. I am worried about the future with it becoming uneven and splintery. Splinters are my biggest concern.
Another question: Can you router the edge of a pressure treated dock? Years ago my husband built a swing set and easing the edges didn't work well, but that was on new wood. Sitting on the side with my legs hanging over is rough on the thighs. Would just sanding the edge a bit work or cause splinters?