Next year’s iPhone will not only be better, but also (even with the same price tag) cost more, inflation-adjusted. That factors into the decision to buy now.
> I’d argue inflation’s incentives are worse - the constant need to invest/spend so that your money doesn’t lose value.
It is a problem when it is at extreme, like in unstable countries where money can be a liability to unhealthy degree. However, I’d argue it should be a liability to a smaller degree.
What you highlight is the ever-present conflict between personal benefit and societal benefit. Obviously for an individual it is more preferable that the value of their money increases; I would never argue that. However, for society as a whole it is more preferable if the value of money decreases at a stable rate.
Perhaps this is why all major economies settled on the idea that an amount inflation is crucial to have.