IMNSHO, one of the biggest problems with the traditional concept of ghosts, UFOs, and similar phenomena is that they are always witnessed at the fringe of our sensory ability. We have well over a hundred years of recording things happening that are barely visible, barely audible, barely detectable. But we also have well over a hundred years of dramatically increasing our ability to detect everything - even things that our human senses can't. And yet all reports of ghosts (etc) are constantly on the edge of what is detectable.
The fact that we all carry around a cell phone with video and audio recording is proof to me that traditional ghosts don't exists. If the ghosts that we could just barely catch on film 80 years ago were in any way real, we'd have 4k video of them now. Same thing with UFOs; if the ones that show up as blips on film and radar 70 years ago were real, so many people would have recordings of them today that the idea of a conspiracy to cover them up is completely laughable. It's the classic Moving the Goalposts fallacy, but the goalposts are our technology.
Of course, this doesn't prove anything about the fundamental concepts of spirits, souls, extraterrestrial life, whatever. But it shows what needs to be said about any report of a person experiencing them. And consequently, any traditional depiction or conceptual framework of them that people take from media, etc.