Something similar, but not quite the same was asked just recently in this thread here, where the overmind @koichi himself answered right here, perhaps it helps.
I understand your point, but in my opinion (just my thoughts), some additional revision never hurts.
This is something where I absolutely don’t agree. Radicals only have one single meaning anyway, but in my opinion, it shouldn’t be different from the kanji meaning at all, since you might end up confusing the kanji and the radical meanings during the reviews.