"Leaf shutter" and "aperture" are not jargon, but specific terms. Just like "pallet arbor" and "escape pinion" are to a watchmaker.
Better example then- f-stop instead of lens aperture. Or Scheimpflug principle. Scheimpflug principle is something that once understood, two words is sufficient to encapsulate the concept, but when not understood, requires an entire Wikipedia entry to explain. And even if you dumb it down for a layperson to "the understanding of how to control vertical and horizontal planes of focus to correct for converging vertical lines", they will probably start tuning out at "vertical and horizontal planes".