There are little adjustments that need to be made once the actual load and pax split are known and staying on a gate awaiting the final figures will likely cause the odd inbound aircraft to have to wait somewhere for it to be clear as there aren't enough gates in many places and even if there are, they are best used efficiently. So ACARS loadsheets are great but if they need another couple of people in that department to make it run more smoothly, then grab a couple of the do nothing office people, like cabin crew managers, and get them to help speed it up a bit.
