I cant believe I have to explain this. Queuing in the drive through means you are standing over an exhaust pipe. That might cause problems for people other than you.

Opening a separate walk-up window is just opening a counter. That's the same thing. Can you think of a reason why they might close the counters? Something what was in the news recently?

What happens when you get your happy meal at the magic walk-up counter? You sit on the pavement with a hundred other geniuses and start horking chud into your bazoo. So now we have a gathering of a hundred random yahoos hanging around outside Burger Town. Can you remember someone on the television talking about "gatherings" recently?