I replaced my MacBook Pro three years after the previous one (13 inch late 2016).
I had no reason to purchase new model if the old one run without malfunction because there was not any transition except speed. Its slowness and instability made me decide to purchase a new one.
Apple’s computer used to change its design even when its minor upgrade. And also its operating system implemented fascinating functions and interfaces on every major upgrade. These changes attracted Apple fans including me, but Apple’s product is not like good old days any more.
I guess both Apple’s hardware and software reached at the level of ideal product. Maybe it is good for most of PC users. Maybe the fact means the end of personal computers as desktop or laptop PC. But I still want to be excited in computer world.