The reasonable thing to do, and what most people did up until the internet arrived, would be to use your current <insert any object name> until it’s either dead or obsolete.
But since the late 90s, consumer reason rarely shows its face, and especially when it comes to buying Apple products.
I’ve owned every single iPhone except the 5C, the SE and the + sizes. 10 years, 10 phones.
When I was a kid, we had the same puke green Bell Company rotary dial phone for 10 years. 10 years, 1 phone.
The normalization of rampant consumerism is...I’ll finish that thought on my 11th iPhone tomorrow.
I generally value things that are well built and run them to the ground before replacing them.
Having said that Tech is different. They progress so quickly, the benefit is in the new. And rate of progress is also accelerating.