Alan Gerber wrote:

Of all the things to sue over, that seems lamer than most. And, if that's
the case, why do they still make, say, pitot covers? Or fuel gauges only
accurate at "Empty"? Or tow bars?

Fuel gauges aren't accurate anywhere. There's no accuracy requirement
in the FARs at all. All it says is the E mark is supposed to
correspond to the end of usable fuel (as opposed to bone dry).