That is a specious argument.

You don't need much of any education to be a street sweeper or a carpenter (I was the latter).

You don't know if the daughter of street sweeper could be the next Marie Curie.

By making education a privilege, over time you'll end up with a lot of stone dense legislators, because the pool of potential legislators is only filled with the children of the rich.

Wealth does not guarantee intelligence. Donald Trump is the poster boy for that slogan.

The US used to understand this. I got my engineering degree from a state school that was much better at educating than ivy league schools (according to US news and world report a couple of decades ago). It was cheap enough that I could get a business minor as well and STILL not have any student loan debts (thanks mom and dad!).

Today those schools are multiples more expensive (also taking inflation into account).

The average US legislator now is very wealthy. With K-12 education privatization and explosive college costs, the next generation of legislators (and a good part of this one) will mostly be only the children of generational wealth.

That is not good for society.