>>95879253I think what you mean is that Fantasy as a genre can have science involved but that which is science is not fantasy.
Fantasy stories can involve science obliquely but not as a primarily science or technology. Instead, science and technology are treated as background assumptions of the setting in order to be meaningfully related to the human experience. Gravity works so things fall down. Whether there's a scientific understanding of why that is or not. Photons propagate, so eyes exist and people can see things. Whether there's any exposition about photons or not.
It's overwhelmingly common for fantasy settings to simply not even realize how much science they just presume and take for granted. Either avoiding it intentionally or accidentally, and the audience doing so as well. It can't really be otherwise. If you had nothing in common with a story, not only could the story not make any sense to you, but you wouldn't even recognize that you're being told a story.
So verisimilitude is a matter of degrees. Always.
What then allows for the mystery? Precisely that prior attempt to suspend disbelief. Science is still there. But the trick is to manipulate the audience to forget about it for a minute and look elsewhere. That is where the mystery can be - that elsewhere beyond the Real... and touching it, adjacent to it.