Former fast food GM chiming in…
…what you’re seeing here is really a symptom of how pathological the quick-service industry is. Upper management types, by which I mean those far ABOVE the store level, generally have not actually worked in one of their restaurants, or did so a long long time ago, and don’t have a holistic feel for how changes like adding new products to the menu or changing cooking procedures affect the flow of business. On top of that, they tend to measure success solely in focus of numbers - “customer satisfaction” is an abstract, but “how long was that car in the drive-thru?” is a number they can put on a spreadsheet and hold restaurant managers accountable for, and those goal numbers tend not to get changed even when the circumstances in restaurant operations change wildly.
In the chain I used to work for, our speed of service goal was 3 minutes and 30 seconds. This was set sometime in the '80s or early '90s, when french fries took 1:35 to cook, procedure allowed for burgers to be prepared in advance and staged, and there were three protein types - small hamburger patty, large hamburger patty, and chicken patty. Breakfast was only served during morning hours, and burgers were not served until after 11.
Fast forward to the 2000s. The french fries have been replaced with a new variety that takes 3:05 to cook. All sandwiches MUST be prepared to order, and patties can only be staged in limited quantities for a brief period of time. Protein types now include three kinds of hamburger patty, (the longest of which takes 2:30 to cook), eight kinds of chicken (the longest of which takes 3:05 to cook), fish filets, steak strips, three kinds of deli meat, - and breakfast is now served all day as well, which means we have to throw in fried eggs, scrambled eggs, sausage patties, and chorizo. The speed of service goal is STILL 3 minutes, 30 seconds. See the problem here? On top of that, labor guide hours have not changed and deployment guides have not changed either, meaning that, at all but the busiest of peak times, there is ONE person assigned to cook and prepare all of those products. (And heaven help you if you get the customer who takes more than 60 seconds to order.)
In regards to the specific situation at Wendy’s, it’s been pretty well publicized that they’ve just redone their entire hamburger line. My guess is that the new hamburgers take longer to cook and assemble than the old ones, that they’ve reduced how long they can stage patties for (so they’ll taste more “fresh”), and that the store employees had minimal training on the new procedures and were expected to pick it up as they went the day it went on sale (since the manager can’t schedule extra time for training without going over his labor guide or cutting shifts elsewhere in the week, which will hurt business even more).
Aside from that, it may be that they DO have a legitimate reason for parking people. My policy for parking orders was only to do it if either the order for the car behind the window would be ready first (because it was a smaller or simpler order, or because what they’d ordered would take less time to cook), or if the customer had added on to their order at the window, and we gave them an antenna ball as compensation for having to pull around.