Indeed, google on promises 2 years. But are typically much more generous. For instance the nexus 5 came out in Oct, 2013. It got marshmallow, but not nougat. I suspect it would have (it has plenty of ram/cpu), but for whatever reason qualcom didn't update the video driver for the snapdragon 800.
If it really bothers you the open bootloader makes it easy to find AOSP built from whatever community that floats your boat.
> If it really bothers you the open bootloader makes it easy to find AOSP built from whatever community that floats your boat.
Or I can buy an iPhone and run the latest software with zero effort.
That is a big difference, especially when you consider that the vast majority of consumers would have to look up the terms "AOSP" and "bootloader" after reading your comment, and even after looking them up, would have no idea what to do.
If it really bothers you the open bootloader makes it easy to find AOSP built from whatever community that floats your boat.