I've been meditating on the 1.23 tech tree for some time. A couple of thoughts, I'm sure some of these you are already aware of or have discussed in the past:
Record Keeping
I always found this tech to be a bit awkward in relation to Writing. The icon suggests it includes non-writing systems like Inca qipu, but not necessarily so. The Writing tech would then represent a more widespread or standardized writing proficiency?
It's definitely better than BtS's Writing and Alphabet combination, because it's more inclusive. Still the name Record Keeping seems a bit awkward and together with the icon specifically designed to include qipu, which are a very unique historical case. Most other forms of early record keeping involved some kind of (maybe symbolic) writing.
I would suggest a renaming of the technology to Administration. This would fit well with the historical trends of the period, like educated scribes in Egypt and Mesopotamia supporting the monarch in their rule. Similar in China. Since Administration requires Record Keeping, this would include the current tech while being a bit more encompassing in terms of historical developments.
Constitution
End of the Middle Ages seems really early for this technology, also considering what we are used to from BtS. For me, the idea of Constitution includes some sort of limited government and is evocative of the American and French revolutions and the year of 1848. The position of Constitution in HR seems to refer to early English Parliamentarianism and the Magna Carta. While the latter is often referenced as an early precursor to a constitution, it did not really function like we understand constitutions of the modern period and was largely irrelevant to how England was governed. Again, I don't think it's a problem with the tech itself but rather that name and meaning differ.
Parliaments themselves are a medieval institution, so I would simply suggest to rename the tech to Parliament. That leaves us without an actual Constitution tech. I think the tech should exist though. Best I can think of right now is to rename Representation to Constitution instead. That position and the effects fit with the understanding of what Constitution represents as outlined above.
Insurance
This tech seems to have no real purpose. Besides defensive pacts it has no effect, and that also only has a tenuous connection to insurance. I can only speculate why the tech is there in its current state, with two possible scenarios:
1. you wanted a late Renaissance tech to enable defensive pacts
2. you wanted a commerce oriented late Renaissance tech, but were left without fitting effects
If it is the first, I would suggest to change the tech to Cabinet. Cabinets came up around the time of the tech's position in Europe, and are connected to the idea of cabinet warfare with its shifting alliances that is thematically fitting with defensive pacts. I also think it's an important and often overlooked political innovation. Heritage (especially since that tech enables Versailles) is a much more fitting prereq than to Insurance, and Cabinet itself would be a much more fitting prereq to Representation/Constitution in turn. Sanitation probably makes less sense as a prereq, so that might need some work.
For the second, I can only think of moving Build 50% Wealth from Finance to Insurance. With Banks and through enabling Charter, Finance is already very useful. In the new position 50% Wealth would also come later, which is more in line with when 50% Science becomes available (Scientific Method).
Personally I prefer the first solution.
Seriously though, HR is probably my greatest source of inspiration outside of the RFC mod ecosystem.
