The purpose of normalized grades is to habituate future workers to this so that by the time they find it in the real world they don't resist.
It's part of reproducing the labor-captial relationship.
It also helps to avoid populist teachers that give everyone a A+++ to avoid students complains, and also idiots that give everyone a C because only God is A and only the teacher is B.
(We don't use that method here, we use other method to try to avoid both problems.)
Where is the incentive for test makers in academia to accommodate this outcome? It sounds nice but I don’t think jaded professors or overworked, inexperienced, and stressed TAs have a reason to do this. It sounds nice but it doesn’t actually seem connected.