Top tier VC firms aren't like Vanguard. They are choosy about their LPs --- that's why they're called LPs and not "investors". They have an investing thesis, and they go sell it to university endowments and pension funds.
Those endowments and pension funds, in turn, have their own investment goals, and they are not as simple as a first-principles analysis on HN would suggest; in many cases, VC LPs are putting money into that asset class knowing that it's going to underperform other asset classes.
So it's a little cringey reading comments about how people here would choose not to invest with Bessemer based on how they handled a liquidation preference. They really don't care what you think here; you and the partners at Bessemer aren't even working from the same premises.
(A good, though very dated, source on this is the old Kaufmann report on VC as an asset class).