We currently get between 20-40 alerts to combine orders on any given day. It would save much time and trouble if you would allow us to just click combine all!
The only time we don't combine orders in our warehouse is if a package is international, some of our customers prefer to place one big order into smaller orders to avoid higher customs fees. Other than that, this sort of feature would be super helpful for us because we combine orders everyday.
We combine 30-60 orders per week, exceptions being that the orders are from different channels/stores, or otherwise instructed by the buyer.
It would be my opinion that a "combine all" or "combine selected" button added to the current system would be better than simply auto-combining, just in case we need to revisit any specific scenario prior to combining.