My Blackberry Android phone is the same, I remember having to train myself not to hit power when I first got it because my previous phone wasn't like this.
Apple seem to have lockscreen "keyboard mash detection" for macOS (where, if you are cleaning your keyboard and therefore mashing down keys as you swipe across them with a cloth, the OS will wake up and process the random inputs a while — until it detects that you've mashed 4+ function-row keys at once, at which point it'll just go back to sleep) so I wouldn't put it past them to have similar logic for iOS.
It seems strange that Samsung wouldn't do something to tackle this. Part of the point of Samsung and other OEMs taking ages to roll out new Android versions is that they're testing and ensuring compatibility.