Your assumption would be wrong. These bike computers have become complex general purpose computing devices with extensive functionality for training, safety, navigation, and even running third-party apps. Manufacturers keep individual hardware models in production for years and add new features through software updates all the time. Customers like me want those enhancements, although it rankles when updates introduce regression defects or (occasionally) remove features.
If you want a simple bike computer that doesn't have updatable firmware, well those are still widely available.
