You seem to be stating that there's a moral imperative that founders voluntarily give away voting rights to investors.
In the case of Uber, the CEO could run the company into the ground, and nobody would be able to prevent that.
A trend toward worse corporate governance could harm the entire economy eventually.
But, I don't see any reason why founders should be obligated to give away voting rights.
In other words, I would argue that if founder CEO's want that level of control, they SHOULD get it.
It's sort of weird to even phrase it as "get it". They already have it by default, and I don't see why we should have any right to force them to give it away.
In theory if/when Uber goes public, the market can hammer his share price into submission. His choice then would be to step down and keep his money, or watch his valuation rapidly dwindle as low as the market dictates.