Here's the way I see it since this is my industry and know what batteries do when they're unhappy.
If you don't agree, you are the reason we can't have nice things.
I buy used phones to have an iphone6+ decoy. Don't even bother charging or activating to keep in my hip pocket when I visit Europe. Because...
Pickpocket suck and they're *everywhere* in Europe.
For the record, I don't remove activation locks. So, enjoy the parts.
If the only way I can avoid owning a "repaired" iThing (that was opened on someone's kitchen table armed with youtube videos) is to buy new, I'm ok with that. I have two A1864s (Verizon 8+), still sealed new in box. Because, except for the pickpocket incident last year, this is the longest I've gone without losing my phone (i7+)