It may be for security reasons if there are known flaws in those drivers. That it "works" at first glance isn't the only thing to consider here. I wouldn't advise turning off the blacklist for day-to-day browsing: those drivers are black listed for a reason.
I agree, and I don't run chrome with the flag for day-to-day browsing. I'd still like to know what that reason is though and how come Firefox doesn't have the same issue.
