Sorry delayed response. Arthritis rating is a low % of overall rating compared to the rest so it was doubtful as a trigger. The arthritis alarm wasn’t anything loud is my presumption, just that the FAA really hasn’t been that busy with pilots falling off the books as many did not need to do physicals for quite some time. My name probably popped as I continued to do physicals due to being required to fly internationally anytime anywhere - never take the chance that any other country will honor FAA policies. They were probably bored to death and we’re just revisiting files for clarity sake.
*Just did a in-person physical/review on one of my high ratings at the 3 year point. I was initially told the VA might review ratings at the 5 year point after retirement and so forth. Maybe because it was a high rating; therefore, 3 years came into play. All went well as the rating was maintained.