[userulluipeste]

Off-topic: I always wondered why there is A-F instead of A-Z. In your order of ideas it is explainable - everyone gets a "G" by default (for "F" one should at least be present) therefore all the rest are left out.

On-topic: If you make "D" the default, when the reality sets in, the new valuable scale becomes A-C (nobody will care or consider one's graded studies if those were "completed" on D "pass" grades). The same is with free money - the amount of pension money will shortly become meaningless because of inflation.