Question: Did anybody keep on using Landlords, Builder etc. after the start of the game? Usually, once I was established enough, I would get only one cleric (for conversions and adopting cities) and the rest of my agents would be knights, to maximize my rate of asskicking. Most of my guys would also be the second/third sons of my kings, to minimize the trouble spies would cause me.
I never used them to begin with. Landlords increase food output, which just isn't an issue for me, and reduce food consumption during siege, again not much of an issue since by the time I have the money to build walls(can't be sieged without them), I'm already in conquer-the-world-asskicking mode. Builders aren't very useful to me, especially in the begining since I simply lack money to build most of it all, and in late-game(or at least, asskicking mode-game), I have so much money I can force-build anything I really need most of the time.
Other than that, my strategy is similar, although I only use a couple Marshals, and mostly Merchants. Merchants+Kingdom Power+building a Tax Office in every city+stable territorial expansion = almost literrally being able to swim in it, Scrooge McDuck-like.
Perhaps
very Scrooge McDuck-like, since if it wasn't so for-kids(at least as much as Disney usually is), I'd imagine Scrooge McDuck using dirty underhand business tactics, hostile buyouts, and possibly even industrial terrorism, to run his business. After all, I've seen a lot of weapons technology come out of McDuck Industries.
Man, did I go off on a tangent there.