I have a 2019 Ford F-250 that I purchased March 2020 and the original wiper blades would scrape and shudder in light rain so I replaced them and then replaced the replacements. I’m wondering if this ...
The wipers should function properly for several years, unless an obvious reason, such as sitting in extreme sunlight/heat continuously.
Another issue that will cause the wiper shudder you describe, is using hot wax treatment at the car wash. Try giving your windshield a good cleaning when replacing wipers, to avoid contaminates.