I never claimed taking photos on a minuscule sensor with a plastic lens is identical to doing so with a high end DSLR. Stops refer to exposure and noise and depth of field have no bearing on a photo's correct exposure. It seemed to me that parent was spreading a common misconception about how exposure works across different sensor sizes so I wanted to correct/clarify that. The whole topic of noise equivalency or depth of field equivalency is completely separate and I just mentioned it to make it clear what part of a camera influences which characteristic (light density for exposure, pixel density/pixel size for noise, sensor size for depth of field)