Garage doors are a very simple yet also very complex part of your house. You know the function it performs, but do you know how it does it?
Do you know the parts that make it work, or would you know how to fix it when something goes wrong? The big majority of people will not know.
Most people don’t know anything about their garage doors other than it opens and closes. So what do you do when it stops working or when it starts making a sound it’s not supposed to.