Many years ago when dinosaurs roamed the earth and i was a young photographer ..................... lens coatings were in their infancy and very delicate, lenses were also unbelievably expensive.
UV filters were an essential to prevent normal wear and tear from damaging the coatings.
Modern lenses are much better and much cheaper. I do not bother with UV filters now, I have had a few lenses saved in the past by them but a good insurance policy and the ability to upgrade to new lenses that are constantly coming out is probably a better option.
I do have an individual polarizing filter for every lens I own and find them indispensable.
"Photography to the amateur is recreation, to the professional it is work, and hard work too, no matter how pleasurable it may be."
( Total NIKON bigot )