That is because we have gotten so far from the Founder’s vision of a republic. We essentially have a popular vote. The republican vote envisioned by our Founders would have been in small areas electing electors who would represent us in selecting a president. The party system killed that. Popular vote killed it even more. And now it is almost totally forgotten. It was how George Washington was selected as the “best person to be president” by the electors who had met for that purpose.
In that system, being a politician wasn’t a necessity. The best qualified was the issue.
There’s a larger point that must be made.
How will it be enforced? Most likely by withholding federal largesse for missing a mandated threshold of voters for each state.
That then allows the next step, which is mandating how and for whom the “voters” vote. This will be determined by census data every ten years (or sooner if necessary to achieve the desired result).
Remember: no Socialist act is a final act. At least not until it all comes tumbling down. And We the People have taken Humpty Dumpty’s place on the wall.