Any dust or dirt on the windshield would start micro scratches with a wiper.
I know it says you can, and some people have had good success with them, others not so much, guess it depends on riding area, type of dirt, etc
I think they do require more care than a glass windshield. Have to watch what you clean it with, etc. Do not use Rain-X!
I am going to try some Glass Science on my Glass windshield. It might be the answer to keeping all of it it clean all the time.
I have the glass flip up windshield, and wiper washer. Spendy, but we think it was a good choice.
if I want to run a snorkel kit, the washer tank has to be moved.