If anything, 7-segment displays are better when it comes to partial failure, as it's reasonably easy to add self-test functionality which measures the current p

If anything, 7-segment displays are better when it comes to partial failure, as it's reasonably easy to add self-test functionality which measures the current passing through a supposed-to-be-lit / supposed-to-be-off segment. This would allow for failure detection without the user having to explicitly press a test button and look for any misbehaving segments. You can't do this as easily (if at all) with LCD or OLED.