I don't know about hardware redundancy, but yes for at least "easily verifiable limiters".
What is "hardware" anyway? Does a microcontroller-based integrator or debouncer count? Depending on how you define that, it can become a serious roadblocker. But anyway, I guess that point is moot for a door handle, you can fix it with stuff that is unambiguously hardware.
What is "hardware" anyway? Does a microcontroller-based integrator or debouncer count? Depending on how you define that, it can become a serious roadblocker. But anyway, I guess that point is moot for a door handle, you can fix it with stuff that is unambiguously hardware.