To not be special, there must be many phones out there getting the same or better support. What are they? Who sells these many other smartphones that have had 3 or more years of updates from last sale?
Certainly not the Pixel phones, they get 3 years support from first launch only, and they're supposedly the gold standard for Android software support. It's pretty much the reason they exist. Yet after last sale support for the 5S matched the Pixel's from launch support, and we don't even know that this is the last update the 5S will get.