It's pretty easy for people who care to "turn off read receipts" by disabling images or blocking it through proxy/vpn/whatever.
What about non technical people who have no way of learning that they are being spied upon?
What about non technical people who have no way of learning that they are being spied upon?
I may be wrong.
"Do you care if your ex-girl/boyfriend can tell every time you read an old email s/he sent you?"
"Have you disabled loading images by default in your email client?"
You will see that you are wrong.
EDIT: decided to listen to my own advice and conduct a (very non scientific obvs) twitter poll.