Dare we refer back to
this thread on the front page showing what happens when you get the QNH wrong??
Granted I think the English/French usage of the ATCO played a significant part, but simply relying on "It's part of the ATIS which you've already told me you've got" removes a layer of safety in the same manner that not confirming your CPDLC-issued departure clearance would.
"Well, we got it printed from 'the magic box', so why do we need to confirm it?"