@Academia Nut : This is going to take off like a rocket, so if you have any summations, clarifications, or expansions to make with regards to geographic vs occupational it would probably be best to post them ASAP.
QM's already told us what the results of each option would be and what they would turn out to be, Guilds are the least corrupt, most meritocratic and most effective of all the options,
Hogwash. People have been leaning towards inherited jobs for generations, hence why we currently have an oligopoly instead of an elected kingship. Guilds decide who and how many can join, and since their status in the government is the same regardless of the number of practitioners represented the powerful few with vital skills have no incentive not to hoard.
Simple: You can change guilds. Castes are forever. Saying that Occupational is a Caste system is like saying that Geographical is a Serfdom system; entirely over-dramatic.
Edit: It also means a lessening of the warrior stratification that's already started to creep into our system, since no other guilds are going to just let the warriors gain full power-and with our Yeomanry system, they have the ability to push back if the warriors try to push the (spear)point.
-if the guild you want to join feels like letting you. If you move to a new area and the local subchapter is ruled by an old codger and his childhood friends who don't want to have enough competition around to force them to work hard to make bank, well, your choices are to move away, get good at digging ditches, or have a couple of blacksmiths play chopsticks across your fingers with mallets for stepping on their turf without a license. All perfectly legal.
Individual guilds won't, but the knowledge will.
Why? The whole point of a guild is to consolidate, concentrate, and limit access as much as possible to the information you are trying to ensure survives the collapse of centralized structures and institutions. Worse, guilds do it in concert with all the other guilds in the ecosystem. They depend on each other, so even if one
does happen to have an offshoot survive, it's going to collapse into disuse when its institutional supplier and customer bases do.
Like, this is just outright bizarre. How do guilds in any way improve the technological robustness of a society? They are specifically engineered for the sole purpose of doing the exact opposite.