That’s the reason we have to still use fax machines right?
I know there are ways to do encryption like PGP on your message directly or I think email sent over TLS? But that isn’t the default right and that’s why I can’t send a picture of my license to the insurance company directly over email?
It’s the same though.
To intercept the email you need to be on a network that receives it (i.e. ISPs).
It being stored unencrypted is a totally different problem (and also for letters, faxes, etc.)