I have read about that complaint quite a few times. However, in my personal experience, Nikon USA repair is right on the mark when my equipment has impact damages. In the few times that the product is defective during the warranty period, every time Nikon has fixed it free of charge, including my FTZ adapter in 2019, a D750 in 2015, an SB-800 flash back in 2005, and a 35-70mm/f2.8 AF zoom back in 1990.
Overall in four decades of using Nikon, I have not used Nikon repair all that many times, maybe within a dozen, but I used them three times between 2018 and 2019. Parts hold seems to be a common delay by a week or two. Their charge is mostly reasonable but certainly not cheap. I have lived on both US coasts so that I have experiences with both Nikon Melville (Long Island, New York) and Los Angeles.