The modern world
Yes of course the account service people needed to see the work. But the CD was the only opinion that mattered.
The CD offered their opinion. And the team acted upon it.
This ensured ideas were clear, strong and very single minded.
Try showing the exact same piece of work to multiple stakeholders and you'll end up with multiple opinions.
Which results in confused and frustrated creatives.
And watered down wallpaper ideas.
Such is the modern world...