I dunno dude. But I've never played a game where you're not allowed to buy the steel sword unless you first buy a wooden sword and then a copper sword and then a bronze sword and then an iron sword first. Usually the lower tiers of equipment are useful in their own right and you buy them because they are what you can afford at the time or they are what is available in the region you happen to be in.
And actually Elite is even sillier than I'm giving it credit for because this is more like a situation where you have to chop down a tree, then mine and smelt ores of copper, bronze, iron, and then finally steel; and then forge every one of those swords, every single time you want to equip a new steel sword..
The more accurate analogy to the swords of wood, copper, bronze, iron, and steel -would be the grades E, D, C, B and A. Just like in those MMOs, you can in fact buy the top-end item outright. Engineering would equate more to the magic items in those MMOs, and should take some effort to get.