Yeah, there are some unreal "slop" games, even big ones, that just look like UE5 looks with kinda default settings, but there are also games made with these engines that look nothing like that.
Let me be annoying and tell you about your second point as I don't really understand your first one. Your perspective is that of a living looking at a dead body. Death itself though isn't an experience of life, Meaning that we can't really talk about what happens after we die. We just don't know and we probably can't know what or how death is. So any answer goes, really. I mean you are right uncertainty doesn't exclude objective reality, but my question in an argument would be: What do you even mean by objective reality?