My personal opinion is that quantum physicists came up with names to give to the fudge-factors you need to make the maths work out. Not only is there not really any spin, but there’s no quantum tunneing.
But it keeps ‘em off the streets, so let ‘em have their fun. That’s what I say.
You forget that tunnel diodes are what make it possible to hear FM radio when you're driving through a tunnel.
The effects are subtle but helpful.