The more U think about this the more crazy it seems.
Mocks arent always secure and teachers can tell you whats on the paper or give big hints on what to study covering only part of the spec. You now essentially get 2 bits at the cherry.
In contrast, private candidates resits and homeschoolers who get no calculated grade are still ignored, lose a year because unis wont wait and have to actually do the work the current 2020 student have avoided. That means a resit student could easily have done twice as much work than someone who gets an A off the back of mocks. They have been really let down.