Very true. The 13 is a minor upgrade year-over-year from the 12. I'll go as far to say you
shouldn't upgrade to a 13 if you already have a 12.
But... how many of the billion iPhones out in the world are actually last year's 12 series? Not that many.
There are still PLENTY of iPhone 11, Xs, X, 8, etc out there whose owners could upgrade to the 13.
iPhones are pretty good these days and can last a long time. Hardly anyone is replacing an iPhone after just one year... and even two years is becoming rare.
So remember that the next time someone says "
this new iPhone isn't much different than last year's iPhone"
It's not for them.