Came here to post this idea to the community, incredibly defeating to see that it was already submitted 5 years ago. Here's hoping it might happen in the next 5 years. From a development standpoint, I can not figure out the multiyear delay in adding an additional string field to a CSV upload.
Why am I not surprised.. Basic feature to allow importing product images was requested in 2016.. 7 years later, we still can't import images. The API also doesn't support adding / updating product images.