Flag rope knots are low key stressful. You only need to do them once every 5-10 years or so, so you don't really develop any expertise through practice. If you do it wrong, you probably have to pay or arrange for a team of two people to lower the flagpole.

The flag rope for our 12 meter flagpole broke. I seriously debated getting a drone to replace it in situ. Then I realized hauling just a few hundred grams of rope needs a fairly serious drone.