I have a galaxy s21 that I’ve been using for the last 3 years. I haven’t noticed any difference in performance from the day I got the phone, and I don’t feel I’ll need to upgrade for another couple years. Full disclosure, I did use adb to remove a ton of Samsung bloat when I got the phone, and that definitely improved performance, so I’m not sure how different my experience would be with all the extra Samsung stuff added.
My work phone is an iPhone and I love this feature. The moment it’s past work hours I no longer get buzzed for any notifications, and I only see direct messages on the home screen