I almost always make a change or two to the standard order, so I prefer to go inside rather than the drive through.
That said, the drive through sound TODAY is a lot better than it used to be when I first started driving, back in the mid-1970s. Much better. Trust me on this.
But I have noticed the same "lack of either attention or retention" when I go inside.
"I'd like a number five, no pickles, no mustard, no onion; onion rings instead of fries; a diet soda; and I'm eating here. They type in the number 5 and ask if I want it "here" or "to go". I remind them that it is "here". I noticed that only two punches had been made, so I reminded them that I didn't want mustard, onions, or pickles on the sandwich and that I wanted onion rings instead of fries (raw onion I can't handle - cooked onion I can, especially with a little catsup). Then I got asked about my soda (no change) and the diet soda (not all places are self serve drinks - they do still control the cups, even if you fill it yourself).
For something that I order three or four times a month (weekly "treat" for myself) - I end up spending 3x to 5x (or longer) in line than anyone making a standard order or even upsizing the drink & fries. I also get handed a bag of food a lot instead of a tray, but that might be on the person making the order up while the counter person is taking more orders (depends on the exact store I'm in).
It's as if the person taking the order either has no short term memory or is using all their attention to find the buttons on the cash register for the next step that they don't recall anything of what I said after "number 5" and have to ask me the next question on the script to figure out which button to push. There are a couple of places that I eat at often enough that I don't have to repeat myself - but I don't eat lunch out every day, so no one business is going to be seeing me as a "regular" enough to know my order before I open my mouth.
Not since the one pizza place when Ambrosia Hino was three, anyway.