Democracy but you gotta pass an IQ test threshold to vote/run?

Setting aside the inherent authoritarianism in excluding double digit percentages of the population from voting, the fact that it wouldn’t work (the negative correlation between intelligence and conservatism is real but small) and the effects of socioeconomic status and race on IQ, historically this is a very good way to disenfranchise minorities (look up literacy tests).

I really wonder what’s the advantage of having stupid people voting/running besides virtue signaling you believe in equality (and having whole society pay for it).

Democracy? Again this is a inherently authoritarian idea, but even if it wasn’t it would quickly be used for authoritarian ends.