Because one uses it, consumes it, interacts with it; and because humans are beings that have volition. Not being aware of one's intentions is not the same as not having any. Without said conceptual schemata, we wouldn't know what to do with those things on the plate. The empahsis isn't on those conveniences pleasing just you and nobody else; but on pleasing. You wouldn't see disease, bad weather, crime etc. as hindrances if you wouldn't already operate out of the idea that this world is there to please you (and should please you).