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My wife just upgraded from a 6S to a 15. Sometimes you just need to stretch it out a little to justify it in the end. I think the 15 will get replaced when Apple iPhones are well into the iPhone 20s.

Myself, I just decided to go with a freebie Android phone for the plan I have to replace my 6S. Android is just as good for what I need and heck of a lot cheaper.
 
Unless your battery is dying and/or the screen is cracked to hell, there's little justification for upgrading IMO, given the slow pace of design changes & tech updates (and even then, replacing the battery and/or repairing the screen could be more cost effective, but YMMV)
Satellite SoS. See my profile why that’s important
 
You can replace the battery
I switched from 13Pro to 13Pro Max when my wife got a new 16Pro Max.

I love the bigger size and better battery life. I tried the 16Pro Max but I don’t see any major reason to upgrade (with these prices).

So I guess next year or so I will just replace the battery. Unless something major happens on the AI front and it actually becomes useful (for me).
 
I switched from 13Pro to 13Pro Max when my wife got a new 16Pro Max.

I love the bigger size and better battery life. I tried the 16Pro Max but I don’t see any major reason to upgrade (with these prices).

So I guess next year or so I will just replace the battery. Unless something major happens on the AI front and it actually becomes useful (for me).
As I said above, it is subjective and personal. I could say there are several good reasons to upgrade from a 13 Pro Max to a 16 Pro Max, such as USB C connector (one connector for all my Apple devices is very handy), better camera, more RAM, which is useful in some applications, a slightly bigger screen with less weight and even better battery life. But those points could be weighted differently for you 🤷🏻‍♂️
 
As I said above, it is subjective and personal. I could say there are several good reasons to upgrade from a 13 Pro Max to a 16 Pro Max, such as USB C connector (one connector for all my Apple devices is very handy), better camera, more RAM, which is useful in some applications, a slightly bigger screen with less weight and even better battery life. But those points could be weighted differently for you 🤷🏻‍♂️

That is a good list. All of them (- the camera) are actually on my list of reasons to upgrade. But the list is still a bit too short and there is the huge minus of the price.

Eventually of course I will upgrade, but looks like my upgrade cycle will be longer than ever before. But on the other hand, I have been and still am super happy about the 13 Pros. And that’s a good thing.
 
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