I wouldn’t worry about a servo. As long it is properly specced for the weight to move the vent they will last plenty long enough. For comparison think about a good 3d printer (or rc car steering) which can easily run without maintenance and “non-stop” for years.By the way, it's a special type of "electric motor" used for absolute positioning. It's called a servo, and complex compared to a simple spinning electric motor. Rivian didn't design or assemble that.