The SEC doesn’t create rules to help people make good investment decisions. They create rules to help people (1) get timely & accurate information to make an investment decision and (2) not get taken advantage of and/or scammed.

The SEC doesn’t care whether accredited investors are more or less likely to go all-in or to make terribly risky and concentrated investment decisions. They only care about whether or not accredited investors are in a position to get (and to a lesser extent, understand) the information they need to make the investment.