I work for a digital display company, and it is definitely redundancy. There will be at least two redundant display systems that go to the modules separately so they can switch between them to solve issues. If a component fails on one side they just switch to the other.
McDonald’s has been on the decline since I worked there 13 years ago. What you’re reporting as dry and overcooked is actually food that has been hot held long past the time it should have been thrown out. You can’t even get a burger patty that has been cooked within the past two hours most of the time unless you’re there during peak times.