Don't buy phones from Samsung. They're the worst. They've been #1 on https://dontkillmyapp.com/ for a while now.
Is there also a dontkillmybattery website listing poorly designed apps that leach my data and energy? Because it's very easy to whitelist the good ones on a Samsung device.
See my reply to the sibling comment: https://news.ycombinator.com/item?id=30665186 I don't know about the current Samsung situation, but there were multiple phones by multiple vendors where whitelisting apps wasn't possible at all, or where it simply didn't work properly.
As DontKillMyApp notes, "the latest feedback suggests even when you remove an app from the restricted list, Samsung may re-add them later after a firmware update or when it thinks it is using too much resources". That is horrible.