You do realize that the term meritocracy is literally a joke, right? I mean, it was actually invented as a joke by a sociologist, who's apparently not very observant because he'd assumed everyone would get it. Obviously, every 'cracy believes that it's a meritocracy; the only defining characteristic of one that actually calls itself meritocracy is a lack of self awareness. The word meritocracy sounds to me exactly the same way "positive energies" sounds to me and you; it makes me laugh because it is a word that expresses absolutely nothing but the cluelessness of those who may use it with a straight face (the only difference is that "positive energies" wasn't originally invented by a physicist as a joke, while meritocracy was).

I mean, a noble family really did have a greater relative contribution to the economy and to society than a common family (or, at least, could have been said to have a greater contribution by the norms of the time) -- until it didn't, and that's when things changed. It's not like previous societies realized that they're not meritocracies; they utterly and truly believed that their system was the best possible one (and they could prove it!) and that there are people who are less represented in positions of power is just bad luck. No society (that lasted long) has ever said, let's put all the people with real talent at the bottom. It's only when resources were allocated differently due to political action (or natural disaster, like the black death) talent "suddenly" grew where everyone had until then known little talent could be found (and they were right: there was little talent because talent requires cultivation to become effective).