I think most people just want to have a good reason to buy a new Apple device and retire the old ones. I know I am. But personally I'm having a hard time finding one. My 2012 MBP is chugging along just fine albeit showing its age sometimes, also my iPad Air2, or the 2013 iMac.

I'm aware that some things have improved but you don't buy a CPU, or a screen, you buy a package. And for every improvement Apple also bundled in some sort of failure. Some in usability, some in reliability, and the overall value proposition is going down.