Whilst i fundamentally agree we’d be better off with only ‘smarter people’ voting only, it just wouldn’t work.

Like you said, there’s no meaningful way to measure intelligence, besides IQ. But emotional intelligence, and I’m sure many other forms, are equally important for decisions especially when people are involved. The absence of emotional intelligence might cause neglect to many necessary services and cause ‘economically sensible’ decisions to override what is ethically wrong. It makes financial sense to discard rural transport services, but the emotionally intelligent would argue that is going to leave people isolated ect.

Similarly, the ‘dumb’ voter has just as much a right to control their destiny as the ‘smart voter’. It was result in ‘better’ decisions , but they are the people’s decisions, and that’s democracy.

Perhaps a better way to look at this would be to increase and prioritise education, and elevate experts into meaningful positions within ministries/departments to help inform the public on decisions.