I did R'D'RD a long time. I knew full PLL before starting to learn 2LOLL... If I had like 4 corners unoriented, I used to use sune to have less corner to orient with R'D'RD
My cubing history is weird since I've taken information here and there...
I know an actual beginner (never interested in learning more than basic LBL, solves first two layers holding the cross on top, doesn't even know full 4 look LL) who averaged under 40.