They have made a few lock styles, but the triad suits most of their designs best, large tough folders for a low cost. Liner locks and frame locks can be appropriately strong, provided expensive machining, expensive design, and expensive materials, cheaper liner and frame locks are OK for light EDC use, but that isn't what most CS blades are geared twards. They had the "ultralock", but unlike the axis lock it was licensed from it was crude and clunky, and while inherently strong, it isn't inherently low cost. The Demco triad just works well, and the need for a tough lock that can take the abuse of hard use, and leverage of a very large blade to me is more important than quick 1 hand closing.