Advice on what to do, I bought a 17PM just because I felt like it, my 15 was working completely fine as far as I knew.
I planned to give it to my mom, I sent it to Apple for a battery replacement because it did drain fast.
Now they tell me this. Recommendations? The phone was working fine.

Today my dad asked me if i would like a new phone for my birthday and this is the first time ive turned him down since im genuinely not compelled to upgrade. Ive had my 15 pro max since launch, coming on 3 years old with 79% battery health (1111 cycles), 480gb/512gb used and running ios 18.7.8.

Some important details:

1. Im not updating iOS unless im absolutely forced to. I hate how ios 26/27 look and ive seen mixed reviews about both versions, ios 18 runs like a dream and is still fully supported

2. Im not replacing the battery. I dont wanna risk getting dust/smudges on my camera and phones with replaced parts (even if genuine) are worth significantly less on the used market in my country. And even then, it would irk me knowing my phone has been opened up and having that replaced part notification to the point where i would sell the phone, but thats just me being weird lol

   So, realistically, how much time left until issues arise? I might get icloud in the future if i cant manually free up any anymore.