[solatic]

Diversifying reduces risk, period. The question is whether the portfolio is diversified enough, relative to its size.

A lack of sufficient opportunity for diversification isn't a problem with the fund, it's a problem with the (investment) market. Offer more opportunities for diversification and the problem resolves. Too bad the economic trend is to consolidate businesses instead of keeping them separate; too bad entrepreneurship is declining; too bad more and more new companies decide to stay private instead of aiming for an IPO.