Are you sure 'dangerous' is the right choice of word? iPhones don't apply particularly heavy skin smoothing even in portrait mode, and don't do it at all if yo

Are you sure 'dangerous' is the right choice of word? iPhones don't apply particularly heavy skin smoothing even in portrait mode, and don't do it at all if you shoot RAW. Android phones generally have an option to adjust the strength of the feature (or disable it altogether). So the answer to your 'where does it end?' question is straightforward: it ends wherever you the photographer want it to end. Portrait photographers have been using various techniques to soften the skin of their subjects since the dawn of photography. Creating an accurate and 100% sharp record of all of someone's skin imperfections might be accurate in a forensic sense, but it isn't necessarily accurate to our everyday perceptions of other people's faces. Optical prints from negatives used to be naturally somewhat softer than modern digital images from high resolution sensors. Not every form of photography benefits from extreme sharpness and detail.