The only counterexample I can think of is In-N-Out, which is always packed with customers and always has a large and very busy kitchen staff.
I think that explains it. The singular Carl's Jr in a nearby city was always busy, for a similar reason. it closed during covid, for whatever reason, and the next nearest one is at least 2 hours away. Compared to the 6 McDonald's in my metro: 4 Taco Bell, 3 Whataburgers, 5 Wendy's, and 4 Open BKs out of 7 that were open prior to 2020.
The Raising Cane's is always packed to bursting, too, because there's only 1 in the area.
My wife laughs at me because every time I see that commercial, I point out that if our local BK (now out of business! surprise!) had to do that, they'd have been out of business even faster. Every single time I went there, they screwed up at least one thing. I just finally stopped going.
It's been so obvious for a long long time now, but people still keep believing that smart things make you faster or give you a better life or whatever, but that just doesn't add up. It's just frustrating, often takes longer and the only reason it is there is to grab your data. There is no other reason.
Edit: Found it. You did get a coke for free. Damn, 2004. https://www.burgerschachteln.de/2004/Sonstiges/index.htm