Ok, let's try a different tack here.
Why does it make no sense? Do you think that you should get rewarded for something you could sneeze on and it would fall over?
I think if pushing your limits to do much harder quests, you should then in turn have a park walk in easier quests, as it is with ALL SINGLE PLAYER RPGS (without scaling enemies). You know.. sidequests, especially in RPGS (Kingdom Hearts, Final Fantasy, Hell take your pick here), are always easy and still give EXP when you do them at a higher level. I want to go grind 30 levels over all content, that is my choice.
HOWEVER, again, I say... I was asking if it was official anywhere.. you said yes it was official, so I am asking you to please share your source. You may THINK it is right, or official, however, until it is said by CDPR or some manual.. it is NOT official. Official requires an OFFICIAL body to state that it is the way it works. That's it... You are attempting to debate gameplay mechanics and progression... which again are your opinions and they will always differ from other people's. I wanted facts only.. Please share your opinion (which you have now.. thanks), and move on if you don't have official information or sources.