Having worked in fast food for a long time, I've noticed that with the rise of ordering on mobile apps, a lot of the apps have started to nudge customers to customize their orders way more. It can be somewhat frustrating to be on the receiving end of orders that would normally sound extreme to order over the counter or through a drive-thru speaker, but the app makes it seem fine. They're usually not a problem other than slowing down the line, but getting them in a rush can be a nightmare.
I do have to say though, I do like the ability to browse the menu without feeling like I have to hurry up and order, and I think the benefits of ordering through an app generally outweigh the downsides.