A defined contribution plan also empowers you to draw down the money as you see fit.  Some of us fear a financially strapped senescence; others would prefer to spend the money while they are healthy enough to enjoy it.  A DC plan gives that freedom.

My mother was on a DC plan, and her partner was a middle manager in the federal government, with, of course, defined benefits.  She was able to retire early and was comparitively wealthy thanks to a shrewd investment advisor -- much better off than her partner, who worked longer for less money.

Her plan was certainly riskier -- but it paid off handsomely.  I have a DB plan and wish I was on DC, since I dislike not having a say in how "my" money is invested or disbursed.  I am very grateful to have a plan at all, mind you, I would just prefer to have more freedom.