[the_mar]

I am not trying to argue with you. The method of separating or combining emails/numbers to me lies within the contact. Because imessages can be sent from both emails and phone numbers (e.g. iphone as well as ipad without cellular connection) i’m not sure if there is a way to handle it while also accommodating your preference

[angoragoats]

Again, this has nothing to do with contacts and everything to do with the interface of the messaging app, as I and the person you responded to said. Also, the person you're replying to literally described a way to handle it while accommodating everyone (offer an indication in the UI of what's happening, and present the option to combine the conversation).