Joe Schmo losing his $20k/yr burger flipping job for a year will suffer far more than Bill Gates losing $20B in a market fluctuation, despite the fact that the latter is literally 1,000,000 times worse on paper. Monetary risk and utility risk are not the same thing and choosing one over the other is equivalent to picking a side in the debate.

As for optimizing opportunity between labor and capital, I tend to suspect that this metric would favor more equitable wealth distribution so as to maximize the feasibility of bootstrapping (low overhead, perverse incentives avoided, nothing remotely exploitative about it on either end of the deal) and to maximize the "surface contact" between capital and labor. But nobody is looking to maximize opportunity in general, only their individual opportunity, and the Nash equilibrium for that process lies in exactly the same place as the Nash equilibrium for wealth.