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To be fair all critical systems can be controlled by hardware buttons below the displays so they don't need a 100% guarantee, worst case rebooting would be fine

Yes, this .. and anyway, isn't the astronauts interaction during critical flight phases completely superfluous to the mission? The screens are there to tell the occupants how close they are to death, it seems, and little else.

Heck, for a long time - decades, even - the principle 'interface' to the rocket systems being used to regularly launch humans to space was, literally, a stick.

Javascript seems like a huge upgrade from a stick. ;)

It ain’t flying civilians so who cares.

Mental note: hold off on considering taking SpaceX flights O_O!