Yes, it sounds like a good idea. Having all the time in the world to reply is a good thing.
While we chat on messaging apps, the receiver is always expecting a quick reply. So we feel obliged to give one. However if the conversation is no the usual chitchat, but rather something with depth, and if you are someone who has a little difficulty turning ideas into words, replying in a hurry may compromise the clarity of deliverance of ideas. In such cases, one could really use an unconstricted time interval and the sense of calm that accompanies it. (My story).
Now, here’s the thing, that service already exists : email. Works best for long and thoughtful conversations. Wanna see your messages at 7am? Go check your email then, just like going to the mailbox and seeing what’s you’ve got. (I’m assuming you were referring to the physical act). As for replies, drafts are the go. Keep editing for as long as you like, then hit send. The receiver sees it when he/she checks her mailbox.
My point is that we don’t need new apps and services for every new idea that is subtly different from ones we already have. Consider this : I have accounts on countless messaging apps out there, most of which I can’t even remember. The last thing I want to do is sign up for another. But I don’t have to. Email works for me. Let’s fix the trivial hassles we come across with hacks like this.
I would like to hear your say.