If the channel is reliable why would I need to know if you've read my message? and why would you tell me in another message? The problem isn't the acknowledgem

If the channel is reliable why would I need to know if you've read my message? and why would you tell me in another message? The problem isn't the acknowledgement, it's the additional steps I have to make to acknowledge the acknowledgement to the email system. Eg Whatsapp has 1 tick for sent, 2 for received, and turns them blue for opened.