Given that the app exists and will save you money it's hard to discourage its use but it seems pretty clear their goal is to obsolete in-store menus to obscure the real costs of their meals. Customers get deals in the short term to encourage conversion but in the long term it will be used for price gouging.
Though long pre-app I remember McDonald coupons in at least school newspapers and the like.
I remember one pretty silly case where a coupon gave you cheeseburgers for less than hamburgers. The local McDonalds wouldn't let you order a hamburger at the cheeseburger price so you ordered a cheeseburger "hold the cheese."
