As soon as you nail hp down to 100% anything you've lost the abstraction part. You've stopped treating hp in your game as an abstraction. Your hp now has a particular non-abstract definition. Get it?
what hitpoints are is an abstraction, what is hitpoints an abstraction of? stuff, the game says what its an abstraction of but does not give the quantities and i think we also have the right to inject our own qualities as well if we want to considering the only other stats in the entire game hitpoints is actually based on is class; and by way of class, experience, and constitution. many people have different ideas about what these qualities could be and the game changes its tune slightly depending on edition, however 5e is what we are talking about. im not going to argue one way or another about which types of qualities should be added that arnt there but i will say its valid. considering many things that the game says hitpoints can be while connecting them to so few stats some interpretive work must be done to fit them all anyway. additionally the game is very open to the idea of the gm's interpretation given what they want to do in the play of their game, further reinforcing the idea that other qualities can be considered for what makes hitpoints.
however im only going into detail about D&D being open to adding qualities not specified to what hitpoints are stated to mean simply to give some credit to those who have exposed their own ideas about what it can mean and also to back up various older edition's interpretations which included other things or didint include some things that 5e does. what im really going to argue is that the game also doesn't specify quantity either, quantity of those qualities, not does it specify the interpretation of those qualities relationships to hitpoints, it just says they are there, it makes no mention of what they mean in their connection to what hitpoints are, hit points just involves them.
SO if the game is open to the idea of gm's ability to have control over the interpretation of what hitpoints is in both quality and quantity and the interpretation of what quality actually means. in my game, with me as gm, 99.infinite integer of 9's behind this decibel point
, percent of the quantity of the abstraction of hitpoints in my game is the added quality of durability fortified by the characters constitution and the rest is everything else people seem to think hitpoints are.
now, as i said before, we are no longer arguing about the topic of this thread, if you dont want to talk about the topic of this thread, i dont think we have anything further to discuss.