All things are not equal when using the Triangle to define exposure.
Aperture also controls depth of field, and the magnitude of diffusion.
Shutter speed controls stopping power and the ability to blur parts of the image or even hide moving objects.
ISO changes the amplification of the signal and the resulting noise levels, but perhaps often more importantly, the available dynamic range.
To teach it as simply three ways to balance exposure is far too simplistic. The costs and gains of the choices are as important as the exposure. to the final outcomes.