Your board and mine are soldered well enough, have no failed LEDs. Perhaps the reason that OCN weenies are having problems with LEDs is that they have PCBs which are not soldered properly--like early M10s--and need some TLC like my Scorpius M10 did.
Hardly a bad soldered led become just dim, and if it happen light will be sensible to vibrations, it will blink, it will be sometimes lit sometimes not, but not dim.
And if for a coincidence this will happen, surely doesn't happen to two leds on the same board.
In that case the user is simply facing the normal tolerance of any consumer electronic component.
Just check any cherry board with ripometer, you will find that one or two switches are stiffer or softer, or less tactile than others.
When the absolute availability of a component is needed, industrial or military grade components are available, but at a price.
The fuel indicator of your car is less important than the one of a 747, indeed the former cost few dollars while the latter cost about 30000$