Generally I have found retractable clothes washing lines very useful. They mainly keep the line clean so that it doesn’t dirty the washing pegged out on it.
My problem has been breakage. I have had them break because they are not capable of taking the weight of heavy washing and due to damage.
The line itself can usually take a lot of weight but the plastic boxes containing and mechanism have failed. In one case I had mounted the box too near to an outward opening door. Then the wind blew it on its pivot flat against the house wall. Later I opened the door which crunched into the box, in its new position, and cracked the plastic.
In 1997 both of my sheds were burgled. I thought I’d made them secure enough. I’d used hasps with the thickest staples I could find on the market (similar to these) and disc padlocks with hardened shackles. But the burglars cut through each staple in two places making a gap through which the padlock shackle could pass. My advisers suggested the burglar used a hydraulic bolt cropper. The burglar cut through steel as thick as a man’s little finger. So I took securing shed doors very seriously and made immediate improvements.