On my truck, no. Several times, I did see some colored paint on the bars, but no powder coat chips at all. I suppose it is mostly dependent on the shape of the door that tries to ding you, surely door dings are still possible, especially from other similar trucks / sport utes. But they do protect well against lower cars and most BMWs
I jacked my truck up multiple times using the bars, you can do this anywhere along the rail as long as you are not worried about torquing the frame. With the triangular structural supports, and multiple bolts, these bars simply will not bend up. I got mine right before Covid set in and the lead time grew to maybe 6-8 months. So worth it though. The price on mine has increased about $250 since I bought them. I had them delivered with the options I selected at $1289, and have them sold to a guy for $1100 (put the stock GM boards back on to trade in). After 3+ years on the truck!