As someone has stated, hiring more staff dont mean better and faster patches. Look at WOW, they doubled their team and yet they have brought less to the table in their last 2 expansions than WotLK and Cata.
The one vacation all at once is probably just a one time deal and next time they will take a break on shift. As they pretty much have been working on 1.0 ending, ARR and HW for over 3 years now.
