I think the crux of the matter with regards to the coffee temperature is that it's a drive thru restaurant.
While handing over a live chainsaw is at best inadvisable, it is all the more so to throw a live chainsaw into the juggling pattern of a clown on a unicycle.
Echoing your point, I can't tell you how many spilled soda's have happened at the drive through with me. Sometimes the lids are not put on right and when I go to grab the cup it collapses spilling into my lap.
