Heh, if I'm carrying around a slab of metal that is a multitool, I couldn't care less if it weighed a gram or two more for the added benefit/safety of implement locks. Plus, locks don't necessarily add weight, as you have to remove some material from the blades to allow the locking mechanism to engage, and the (leatherman-style) locking levers are usually placed in cutouts. Then there's the old supertool lock which definitely didn't add any weight to the tool. So, no... The Wingman and Sidekick don't have locks just to keep their cost of manufacturing down; nothing to do with weight or utility or anything else here.