Been rocking a oneplus 8 for the last two and half years, replaced the back glass a couple times and the battery once. I definitely don’t baby my phone, it’s a tool meant to be used, but overall am pretty good at not dropping things so I can reckon I’ll keep going with it until it gets too slow or something breaks.
When choosing a new phone, I usually go for something new that’s one level below the latest flagship, and check to see if LineageOS is being developed for it, as then I know it’s likely to receive software updates for long after I’ve moved on to the next.
Thing is, I like, many people here, am a techie, and I’m not afraid to install custom ROMs and open up my phone for repair. The majority of people don’t want that, so I’m really looking forward to the upcoming EU regulation on user replaceable batteries! Then it’s possible for everyone to keep their phone for longer.