Universal life insurance policies give you the freedom to pay whenever you want, in whatever amount you want. However, they also give you the responsibility to maintain sufficient cash value in your policy to cover all charges against it, and a lack of careful attention to cash value can lead to policy lapse.
A guaranteed death benefit rider sacrifices the freedom of universal insurance in favor of stability: a required payment schedule is imposed, but the policy is still a universal policy. It is not designed to mature.