I don't understand this attitude. Stripped bare also means you have less shit that can go right. Don't just do a cost analysis, do a cost/benefit analysis.
Better cab ergonomics leads to less driver fatigue, which leads to less accidents and therefore less downtime. Sometimes it actually pays off to have a higher maintenance workload, especially since most of it is planned downtime, or features that don't have fixed urgently. And sometimes this idea of radical simplicity only shifts maintenance workload from one component to another. One example that gets a lot of pushback in US trucking is steering trailer axles. They are indeed more "shit that can go wrong", but not having them and constantly dragging your tires means you're going to have to spend more time changing and re-treading your tires. Look at the whole system, not just one feature in isolation.