My BK does that too. And I can tell you from about 3 years of working in fast food myself, they do it to make sure drive-thru doesn't get backed up. If your food is a big order, or you order something they need to put through the fryer for a few minutes (Like chicken nuggets, patties etc.) that will take longer than the typical burgers because they don't have those pre-made in a meat chest already. So in case another vehicle does go through the drive-thru that maybe just orders a fountain drink and a cheeseburger, they can get those orders out of the way first so that the orders don't get backed up and workplace goes to hell.
how about they do orders on a first come, first served basis
That can easily backfire. Someone getting coffee shouldnt have to wait for the guy in front buying enough food for an army of children that may take a long time as its more than they can handle at once or whatever...
We should just abolish line culture altogether. Just everyone crowd around the menu and shout your orders in unison.
But I actually like getting my food, so... ---
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