Guys, lets go a little easy on laying this at the feet of the engineers. Having been an engineer in heavy industry, it is likely not those folk who make the decision on the number or type of fasteners used to secure the suspension to the body. It is usually a combination of factors but primarially boils down to cost. Cost for the extra fasteners, cost for more metal needed to make the component, cost of additional machining time, cost of added labor time to install, etc, etc. Blame those that control the purse strings and attempt to get by at the lowest level of cost.