What? Does the degree of failure not matter at all? That makes no sense. The question is whether all these parts are actually meeting the specified failure tolerance rate.
It matters, but if the rate of failure is high enough to be expected to be encountered within an all-fleet, constant flight environment for the lifetime of the aircraft, then you plan for failures as well as having the pilot know what to do when there is a failure.
In air sensors like this, their failures are higher than the rate at which you can ignore. They fail on their own, they get bumped and bent on the ground, they ice over in the air, or have objects striking them.
