I understand that to an extent.
Like, i do sometimes go through without really knowing what I want but i usually figure it out within the first few seconds.
But my mom would write down what everyone wanted before leaving the house so she can make the order and go.
If you dont know the menu, you're lucky nowadays to have this thing called computers which has these things called websites that will let you view their menu.
If you dont have a computer, go inside and view the menu so you can familiarize with it before using the drive through. That way you don't hold up the line in the drive through. Also know the inside menu may be laid out a bit nicer because it has more room to display more items. The drive through, it's more compact because of the smaller amount of room. It isnt ideal for someone who isn't familiar with the menu. But this is mcdonalds. The items rarely change. The only things that really change are seasonal items like the pies, mcribs, glazed tenders, and mccafe flavors. We still have the big mac, the quarter pounder, cheeseburgers, kids meals, etc*. Usually these things you learn about via ads.
*different mcdonalds have different owners so things may vary. Don't take it as gospel truth. My location doesn't have blue Powerade while other locations do.
Also, i dont mind them saying "number 1 egg muffin meal", but adding "with a hashbrown bothers me so much.
Lunch is a bit different. They don't need to add "with fries" unless they're asking for a medium or large fry. If you tell me a meal, you automatically get medium unless you request a large.
Super size isn't a thing. Hasn't been since the early 00's. People still ask for super size. You don't need that much McDs.
And about the meal thing, i can tell by how they word things usually if they want an extra hashbrown. Usually they say "and another hashbrown"
If I'm unsure or just verifying I'd ask if they wanted a total of 2 hashbrowns or just 1 so that I can make sure they get their order correct