Do you grab the screwdriver when you want to drive a nail? How about grabbing the hammer to tighten the nut on a bolt? Of course not! You go to the toolkit and pick the right tool for the job at hand. The same logic applies to proper use of Life Cycle Assessment (LCA).
The reality is that LCA is one essential tool, in fact one of the oldest, in a toolkit stocked with complementary tools that aid in evaluation of the potential environmental impacts of a product system throughout its life cycle.