haven't seen the stream. Is the confucian bureaucratic unplayable because it was shown on Western Protectorate, or did they explicitly say that this government is unplayable as a whole for some specific reasons?
I'm guessing it's because it's non-dynastic. It's probably hard coded to cause an instant game over like a theocracy or inland republic.
But as noted, it's fairly trivial to mod a feudal-group government with the same bonuses... a shame it's just otherwise unavailable though.