It's worth noting that the "FAVORED" bonus happens AFTER diminishing returns, which is good. If you have 10 in a SA that's favored, and the bonus is hypathetically 30%, you do NOT get 13 points in the SA with diminishing value after 10. Rather you get the value of 10 points in the SA, with an additional 30% boost. This is especially important when therorizing the importance of SA's over 10, because say the 13th point in a SA is only 40% effective compared to a 1-10 point. Well that 40% point would get that full 30% favored boost so it would be now equivalent to a 52% effect point.
tl;dr
tl;dr