Disappearing dead bodies ruin the immersion

I feel lately that most games just cant quite grasp realism anymore. 

The game looks fantastic with the beautiful colours, star wars sceneries, it just looks and feels Star Wars! But yet it's the finer things in games that developers miss. 

You use a light sabre that can cut through anything except your enemies, the light sabre when active can leave residue markings on a wall or the ground when you strike but when its out for show it can disappear through walls and everything. Bodies disappear after seconds of killing them why didnt they take the rule out of Shadow of War? That had a great action feel to it that looked so real bodies and body parts where still I  the ground. As i said, it's the finer things that fans want to see.