In the studio I have always thought that filters on lens were not needed.
Outside, I thought that the were ok, but didn’t think too much about it.
I have spent the last 7 days at the beach. A very windy beach. With the wind coming off of the ocean. I am surprised at the amount of sand and salt spray that are in the air.
As I was washing my UV filter in soap and water to remove the film I was glad that I do have a good glass filter on the front of my lens.