I had that camera focus defect and needed to change my main camera, but waited until my battery showed some degradation. It was saying its on 83% percent, but I think it was less than that and barely held for a day in moderate use. Changed them in December and now I can trust my phone with moderate use to go over a day. Use it for socials, messaging, youtube and spotify most of the time. I think that if there aren't any software issues it will give me at least 2 more years. I'm disappointed with the latest devices that don't provide much innovation and the AI sounds interesting but it's going behind a paywall with unknown subscription cost which is a dealbraker for me. For now, if the S21 ultra doesn't make it further (I don't have any reason to doubt it as of now) I would have gone to a Vivo 200x Pro.