The cost of the vehicle components is a surprisingly small part of the overall cost of a vehicle. The cost of the line time and the additional tolerances to fit those cheaper components is vastly higher than the cost of stuff they're going to install anyway.
Being able to separate design decision timelines on how the UI works from manufacturing timelines is also very helpful organizationally.
I think these are the right answers. LCDs are already wired and don't need someone's hands to do it. And you can, in software, however late you want in the process, add a button for this or remove a button for that. In software development this is a given, but in real world manufacturing it's like a super power.
Being able to separate design decision timelines on how the UI works from manufacturing timelines is also very helpful organizationally.