What have u just ate that it made ur brain run amok with sending false signals to ur mouth to get it to spur this gibberish? U press confirm when u see the incoming transfer of coins into ur wallet. That is where u confirm receiving of the coins on ur part. How hard is that to fathom. I will make an infographics to lay that out for u.
It would make sense if you put it that way (to confirm an upcoming transaction), yes, but if you look at their mockup, you'll see that the button is on the instant messaging page and not on transaction or wallet page, indicating a feature that allows us to confirm (whatever that is) an incoming chat.