Why use any human-like image then? A lot of amateur fashion designer on instagram use mannequins or busts. The models are serving a purpose. Removing them means someone loses a job.

If we look at this from top-down you're right because the company is saving a cost. But from the bottom-up, you've just become more expendable. This leads into the arguments others have been making, what happens when eventually people can't work? And why should we use technology to serve the few and not the many?