You'll love it when you find out 50% taxes after various surcharges is really only something that can be accomplished with a modern state's apparatus
You'll love it to find out that taking most of a peasants harvest and forcing them to work for you aswell for free was easily possible and done back then
It was prime farmland due to the rainfall it gets, along with new towns and cities being founded, not all of Normandy's wealth came from vikings having raided france and elsewhere beforehand
Most of france ist "prime farmland" so that point is total bullshit
How little control of England do you think the kings of England held before the Conquest?
Considering that vikings frequently raided them with the kings having no money nor troops to defend or build defences on their lands it should be pretty obvious how little control they had
You keep saying "scriptures" which has a more religious connotation than texts would. The Renaissance wasn't founded on "stolen" islamic knowledge, given they went above and beyond the work of previous islamic scholars, and popularised latin originals. How many scientists do you think existed in the Renaissance, given it was so long before the modern scientific method? When scholars are patronised by rulers, they help each other out.
New knowledge was only created during the late stage of the Renaissance with DaVinci being one of the first to use actual empirical methods, so yes the Renaissance itself was the stealing of knowledge from Arabian and Asian sources going beyond that was done in the next age
Also I don't need to think about how many scientists existed, since estimates have already been made with less than a thousand "scientists" existing before and multiple thousands during the late stage
Also only a fraction of a fraction was patronised by rulers so that point is irrelevant
How can an administration keep itself in line if there's an incompetent ruler/regent?
Guess what: When an incompetent ruler doesn't care for the administration that doesn't mean that he is actively destroying it, as long as he doesn't do that most administrations can keep themselves going for a time
Illoyal isn't a word, and there were unlikely to be Normandy vassals to be evicted by vikings, given the Normans came afterwards. The Rorgonids and Capets aren't known for being particularly disloyal whilst guarding the March of Neustria as it existed at the time
Guess what: American English isn't the only dialect in existence
And what do you think the Normandy was? Some desolate wasteland? It had landholders which were vassals to the French king like any other land in france and these landholders WERE evicted when the vikings took the land, so go on and tell where the "win out" was for these vassals when they refused to show loyalty and withhold troops and taxes from their king so he can't defend them and his land
Milan, Florence, Genoa, Ancona, Siena, Pisa, Bologna lucked out pretty good from gaining more and more autonomy
Milan was nearly completely destroyed during the collapse and only regained status in the 12th century
Genoa was razed and looted during the collaps only regained status in the 10th century
Ancona was looted multiple times during the collaps only regained status in the 11th century
Siena was a minor city that was put under control of the lombards only gained status in the 12th century
Pisa was put under control of lombards and suffered destruction during these wars only gained status in the 10th century
Bologna suffered destruction through the lombards aswell and only gained status in the 10th century
Florence through it's location is the only one which entered stagnation and an early recovery, all other cities you listed suffered during the collapse and were put under feudal control and only regained or gained status CENTURIES later
Do you think there were a thousand dynasties that died out, after initially being granted lordships, within a century?
The middle ages lasted more than a century
And yes, thousands of dynasties and branches died out
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