Real improvements in drive thru speakers and mics would be great.
All of the communication technology around and drive throughs sound like vintage phone calls.
Part of the sound degradation is because, no matter where you are in the US, your MacD drive-in order is taken by a person at a call desk in Chicago. The employees process the order and hand you your food.
I imagine it helps prevent in-store theft and keeps an eye on cash flow in real time. And fewer employees need to understand English.