It's been very clear since it's launch that Dead Rising 4 hasn't been that well received amongst its fans. A big part of that revolves around the fact that the game itself doesn't seem to live up to the same quality of the past games. While it may not be more realistic for a body to full on do the worm when it gets shot, it isn't more accurate to have it lay there unmoving either.
YouTuber Crowbcat made a nice comparison video that highlights some of the small...but notable differences between the two that would have been appreciated had the team taken a little extra time working on the game. It may come off as nitpicky...but in a game that's gameplay experience essentially is running around and killing mass hordes of zombies that detail matters.