I think you are right.
At times I've felt my ID3 is a bit like a mobile phone - I must have the latest features and the most up-to-date software. Then of course I remember that the car functions perfectly well with its original software etc - it starts, drives and stops; the lights work as does the air con and so does every other function.
There is something insidious about what you've called upgrade-itis - I've got a pen and a watch that were my late father's and they must be both over 50 years old. I use them everyday and they do their jobs nicely. As a society we do need to stop yearning for the latest innovation - its wasteful and often doesn't make us happy.
Watches and phones are the biggies re upgrade-itis (your spelling of this non-word is better than mine!).
The state some (many) people get into when an 'upgraded' product comes out.
Apple are incredibly good at tapping into this behaviour.
Happens elsewhere too; I read on a Garmin forum the other day that a guy with an Instinct 1 watch (I have one too) who wears it 'hardly ever' wanted to know if he was missing out on new features on the Instinct 2.
I asked why this bothered him as he hardly uses it anyway and he responded that he 'likes the latest bling'. It's a functional and very capable tool watch for goodness sake. The 2 looks virtually identical to the 1!
Bonkers imo.