Almost any definition
Almost any means that there are a few resource efficiency parameters that are known in scientific literature, but where there is no political consensus (yet) on if and how they should be tackled. Examples are abiotic depletion potential (ADP) and land use, where it will be difficult for the Ecodesign directive to develop measures on the short term. Other than that, the Ecodesign directive covers the whole product-life cycle, from production, distribution and use to end-of-life, and allows addressing all types of resource efficiency aspects.
Almost any means: a part for a set of measure zero.