> I'm not trying to say it's right or wrong here, just that it's obvious from all human behavior that seeing what a person looks like is an important part of working with them.

You will see it during the actual interview stage (whether it is done through a videocall or in-person), why would you need it during the resume stage? So you can use a single photo of theirs as a factor when deciding whether to filter out a resume or to proceed further?