I addition to being easier on the hands, people have to keep in mind that nylon rope degrades over time. So oversizing it buys you more service life.
A boating magazine I read did a test on anchor and dock lines. On average, they found that the lines that were in active use failed at well below their rated strength just because of age.
I’m going from memory here, but docking lines were especially bad because they are out in the sun. Some of the dock lines they tested broke at only 10-20% of rated load.
Anchor lines were better, but quite a few of them failed at 50-60% of rated load.
Their conclusions were to oversize all critical lines (docking, anchor, and tow) and replace all critical lines every 3-5 years or less.
Grouse