Of course you need all that stuff. (I did say my description was strictly macro-level?)
A lot of the local administration fell to, if you will, upper-division peasantry-- village leaders and so on. (That’s kind of what the local peasant hierarchy was for.) Beyond that, you have a lot of variance between localities and even individual noble estates. And of course you’ve got other entities like merchants moving in between. Then, also, being a peasant didn’t mean being totally powerless-- a village leader could, and often did, do all kinds of stuff to provide for the community and make ends meet, without necessarily needing to bother the local petty lord.
When you’ve got a nobility that’s allowed to cut you down if you annoy it, you find ways of not annoying it.
As for noble households, that’s … really not something I even touched on. The old aristocracy had its own practices and procedures and customs and … so on. They almost all got uplifted, along with their household retainers of whatever level and caste, though. That’s a way of life that’s just kind of outright extinct.